This is an odd one. Below are two flow exports. Each individually will import and run ok. However if I import one and then the other (either order) then importing the second one shows a popup error in the browser - Type error: Cannot read property of undefined (reading category) .
The browser console shows
TypeError: Cannot read properties of undefined (reading 'category')
at Object._ [as import] (red.min.js?v=:16:78556)
at Object.Ft [as importNodes] (red.min.js?v=:18:270747)
at E (red.min.js?v=:19:69139)
at HTMLDivElement.click (red.min.js?v=:19:50440)
at HTMLButtonElement.<anonymous> (vendor.js?v=:10:176787)
at HTMLButtonElement.dispatch (vendor.js?v=:2:43090)
at v.handle (vendor.js?v=:2:41074)
Using node-red 3.1.3, nodejs 20.5.1
I found one other similar report, which was not resolved.
Flow 1
[{"id":"5ed5dcc8ccf90bfa","type":"group","z":"bdd7be38.d3b55","name":"Publishing to MQTT","style":{"label":true},"nodes":["b4227ef182f4ebef","a500a548eac99f1f","e7642367d639d549","ea94f646fa8e74e1","c04777c7cc3990a0","81428d3bcae766ee","86207c4b47bf3bd8","c458a09df04445f7","753fc1cc8863871e","e54df0d3d9480ac9","d13ea5ab5d57a0a7","43a40f5eb76748ac","cf6c087e45a7fbbf","de21d8a733a9c353","2fb7f6196432da68"],"x":54,"y":4659,"w":1172,"h":322},{"id":"ae9c6995a156ff5c","type":"subflow","name":"Delivery subflow","info":"","category":"","in":[{"x":50,"y":81,"wires":[{"id":"0b0e1e2df36d2d3a"}]}],"out":[{"x":420,"y":80,"wires":[{"id":"0b0e1e2df36d2d3a","port":0}]}],"env":[{"name":"controlProperty","type":"str","value":"control","ui":{"label":{"en-US":"Property for OK or FAIL"},"type":"input","opts":{"types":["str","env"]}}},{"name":"OKValue","type":"str","value":"OK","ui":{"label":{"en-US":"Value of success"},"type":"input","opts":{"types":["str","num","bool","env"]}}},{"name":"FAILValue","type":"str","value":"FAIL","ui":{"label":{"en-US":"Value for failure"},"type":"input","opts":{"types":["str","num","bool","env"]}}},{"name":"retrySecs","type":"num","value":"60","ui":{"label":{"en-US":"Retry period (secs)"},"type":"input","opts":{"types":["num","env"]}}},{"name":"maxQueue","type":"num","value":"100","ui":{"label":{"en-US":"Max messages in queue"},"type":"input","opts":{"types":["str","num","env"]}}},{"name":"contextStore","type":"str","value":"default","ui":{"label":{"en-US":"Context Store to use"},"type":"input","opts":{"types":["str","env"]}}}],"color":"#DDAA99","status":{"x":420,"y":160,"wires":[{"id":"89ab963214b94f59","port":0}]}},{"id":"e6a7f648cf7f127b","type":"inject","z":"ae9c6995a156ff5c","name":"Retry ","props":[{"p":"${controlProperty}","v":"__trigger","vt":"str"}],"repeat":"${retrySecs}","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":100,"y":181,"wires":[["0b0e1e2df36d2d3a"]]},{"id":"89ab963214b94f59","type":"status","z":"ae9c6995a156ff5c","name":"","scope":["0b0e1e2df36d2d3a"],"x":300,"y":160,"wires":[[]]},{"id":"0b0e1e2df36d2d3a","type":"function","z":"ae9c6995a156ff5c","name":"State machine","func":"let store = env.get(\"contextStore\")\nif (store === \"default\") store = null\nlet stat = context.get(\"stat\", store) || {state: \"initial\", queue: []}\n// can't use a switch here I think as need to compare against env value\nconst control = msg[env.get(\"controlProperty\")]\n\nif (control === env.get(\"OKValue\")) {\n handleOK(stat)\n} else if (control === env.get(\"FAILValue\")) {\n handleFAIL(stat)\n} else if (control === \"__trigger\") {\n handleTrigger(stat)\n} else {\n // no valid control value so must be incoming message\n handleMessage(msg, stat)\n}\n//node.warn(`state: ${stat.state}`)\n// decide what to do next based on the new state\nswitch (stat.state) {\n case \"initial\":\n case \"waitingForMsg\":\n sendMsg(stat) // send next message if any\n break;\n \n case \"waitingForTrigger\":\n case \"waitingForOKFail\":\n // do nothing\n break;\n}\nnode.status( `${stat.queue.length} ${stat.state}` )\ncontext.set(\"stat\", stat, store)\nreturn null;\n\n// Called when message to be queued is received\nfunction handleMessage(msg, stat) {\n //node.warn(\"handleMessage\")\n // push a clone onto the queue\n stat.queue.push(RED.util.cloneMessage(msg))\n // limit number in queue\n const max = Number(env.get(\"maxQueue\"))\n if (!isNaN(max) && max > 0) {\n // max length hit, remove oldest\n if (stat.queue.length > max) stat.queue.shift()\n }\n // Simulate a trigger event to handle any state change needed\n handleTrigger(stat)\n}\n\n// Called to send the next message off the queue if any, but leaves it on queue\nfunction sendMsg(stat) {\n //node.warn(\"sendMsg\")\n let thisMsg = stat.queue[0]\n if (thisMsg) {\n // send a clone\n //node.warn(\"sending\")\n node.send(RED.util.cloneMessage(thisMsg))\n stat.state = \"waitingForOKFail\"\n } else {\n // nothing in queue\n stat.state = \"waitingForMsg\"\n }\n}\n\n// Called when OK response received\nfunction handleOK(stat) {\n //node.warn(\"handleOK\")\n // ignore if in wrong state\n if (stat.state === \"waitingForOKFail\") {\n // OK received so drop the top message \n stat.queue.shift()\n // set the state to waiting for message, which will allow the next one to be sent\n stat.state = \"waitingForMsg\"\n } else {\n node.warn(\"Ignoring unnexpected OK\")\n }\n}\n\n// Called when FAIL response received\nfunction handleFAIL(stat) {\n //node.warn(\"handleFAIL\")\n // ignore if in wrong state\n if (stat.state === \"waitingForOKFail\") {\n // FAIL received so go to waiting for trigger state\n stat.state = \"waitingForTrigger\"\n } else {\n node.warn(\"Ignoring unnexpected FAIL\")\n }\n}\n\n// Called when a trigger message is received or after a new incoming message is queued\nfunction handleTrigger(stat) {\n //node.warn(\"handleTrigger\")\n if (stat.state === \"waitingForTrigger\") {\n //node.warn(\"state to waiting\")\n // set it to watitingForMsg in order to trigger send \n stat.state = \"waitingForMsg\"\n }\n // ignore for other states\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":280,"y":80,"wires":[[]]},{"id":"b4227ef182f4ebef","type":"change","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"FAIL","rules":[{"t":"set","p":"control","pt":"msg","to":"FAIL","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":810,"y":4840,"wires":[["a500a548eac99f1f","c29d72a6228dcc80"]]},{"id":"a500a548eac99f1f","type":"link out","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"","links":["e7642367d639d549"],"x":1185,"y":4840,"wires":[]},{"id":"e7642367d639d549","type":"link in","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"","links":["a500a548eac99f1f"],"x":135,"y":4800,"wires":[["e54df0d3d9480ac9"]]},{"id":"ea94f646fa8e74e1","type":"comment","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Send MQTT messages to this link","info":"","x":210,"y":4700,"wires":[]},{"id":"c04777c7cc3990a0","type":"mqtt out","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"","topic":"","qos":"1","retain":"false","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"e3d45312.a3103","x":710,"y":4740,"wires":[]},{"id":"81428d3bcae766ee","type":"trigger","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Timeout 5 secs","op1":"","op2":"0","op1type":"nul","op2type":"num","duration":"5","extend":false,"overrideDelay":false,"units":"s","reset":"","bytopic":"all","topic":"topic","outputs":1,"x":660,"y":4840,"wires":[["b4227ef182f4ebef"]]},{"id":"86207c4b47bf3bd8","type":"comment","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Adjust timeout time if necessary","info":"","x":690,"y":4800,"wires":[]},{"id":"c458a09df04445f7","type":"complete","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"MQTT Complete","scope":["c04777c7cc3990a0"],"uncaught":false,"x":180,"y":4940,"wires":[["753fc1cc8863871e","43a40f5eb76748ac"]]},{"id":"753fc1cc8863871e","type":"change","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"","rules":[{"t":"set","p":"reset","pt":"msg","to":"true","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":400,"y":4840,"wires":[["81428d3bcae766ee"]]},{"id":"e54df0d3d9480ac9","type":"subflow:ae9c6995a156ff5c","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Guaranteed delivery test","env":[{"name":"maxQueue","value":"0","type":"num"}],"x":410,"y":4740,"wires":[["81428d3bcae766ee","c04777c7cc3990a0","cf6c087e45a7fbbf"]]},{"id":"d13ea5ab5d57a0a7","type":"join","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"key","joiner":"\\n","joinerType":"str","accumulate":true,"timeout":"","count":"1","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":770,"y":4940,"wires":[["de21d8a733a9c353"]]},{"id":"43a40f5eb76748ac","type":"change","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"key: completed, save topic and payload","rules":[{"t":"set","p":"key","pt":"msg","to":"completed","tot":"str"},{"t":"move","p":"payload","pt":"msg","to":"payload.data","tot":"msg"},{"t":"set","p":"payload.topic","pt":"msg","to":"topic","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":520,"y":4940,"wires":[["d13ea5ab5d57a0a7"]]},{"id":"cf6c087e45a7fbbf","type":"change","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"key: sending, save topic and payload","rules":[{"t":"set","p":"key","pt":"msg","to":"sending","tot":"str"},{"t":"move","p":"payload","pt":"msg","to":"payload.data","tot":"msg"},{"t":"set","p":"payload.topic","pt":"msg","to":"topic","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":510,"y":4900,"wires":[["d13ea5ab5d57a0a7"]]},{"id":"de21d8a733a9c353","type":"function","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Check messages match","func":"/** Check that the message that is has been sent (completed) is the one that has just been passed to the MQTT node (sending)\n * payload.sending contains last msg sent to MQTT node\n * payload.completed contains msg indicated completed by MQTT node\n * in each case the payload contains topic of message and payload value in data\n */ \nconst previousKey = context.get(\"previousKey\") || \"\"\nconst thisKey = msg.key\n\n//node.warn(typeof msg.payload.sending.data)\nif (thisKey === \"completed\" && previousKey === \"sending\") {\n let equal = false // whether messages are equivalent\n // topics must be the same\n if (msg.payload.sending.topic === msg.payload.completed.topic) {\n if (typeof msg.payload.sending.data === \"string\") {\n equal = compareDirect(msg.payload.sending.data, msg.payload.completed.data)\n } else if (Buffer.isBuffer(msg.payload.sending.data)) {\n equal = compareBuffers(msg.payload.sending.data, msg.payload.completed.data)\n } else {\n equal = compareJSON(msg.payload.sending.data, msg.payload.completed.data)\n }\n }\n if (equal) {\n msg.control = \"OK\"\n } else {\n msg.control = \"FAIL\"\n }\n} else {\n // out of sequence so ignore\n msg = null\n}\ncontext.set(\"previousKey\", thisKey)\nreturn msg;\n\nfunction compareJSON(sending, completed) {\n // compares JSON version of payload sent with that from the Complete node\n return completed === JSON.stringify(sending)\n}\n\nfunction compareDirect(sending, completed) {\n // directly compares payload sent with that from the Complete node\n return completed === sending \n}\n\nfunction compareBuffers(sending, completed) {\n // compares buffer payload sent with that from the Complete node\n let answer = false\n // check completed is also a buffer\n if (Buffer.isBuffer(completed)) {\n answer = Buffer.compare(sending, completed) === 0\n }\n return answer \n}","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":970,"y":4940,"wires":[["a500a548eac99f1f","c29d72a6228dcc80"]]},{"id":"2fb7f6196432da68","type":"link in","z":"bdd7be38.d3b55","g":"5ed5dcc8ccf90bfa","name":"Send to MQTT","links":[],"x":160,"y":4740,"wires":[["e54df0d3d9480ac9"]],"l":true},{"id":"e3d45312.a3103","type":"mqtt-broker","name":"","broker":"owl2.local","port":"1883","clientid":"tigger","autoConnect":true,"usetls":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"autoUnsubscribe":true,"birthTopic":"tydwr/tigger/LWT","birthQos":"0","birthRetain":"true","birthPayload":"Online","birthMsg":{},"closeTopic":"tydwr/tigger/LWT","closeQos":"0","closePayload":"Offline","closeMsg":{},"willTopic":"tydwr/tigger/LWT","willQos":"0","willPayload":"Offline","willMsg":{},"sessionExpiry":""}]
Flow 2
[{"id":"72e9a4edb56a84a7","type":"group","z":"db2da7ec2cdcbc9c","name":"Sending emails","style":{"label":true},"nodes":["40032b86.16b0dc","9d7e52ff.9373a","98d72bd3.c5c98","78bcff9d.8c29c","eada5d9a.8c60e","87580f77.38e0a","75675144.54ee98","26ef1404.562c74","52c5b999.776288","a246571e.945ae8","406fad44.dfcbdc","be8e3686.b3db4"],"x":34,"y":39,"w":722,"h":362},{"id":"149380c1.63e107","type":"subflow","name":"Delivery subflow","info":"","category":"","in":[{"x":50,"y":81,"wires":[{"id":"62560ae6ab8737dc"}]}],"out":[{"x":420,"y":80,"wires":[{"id":"62560ae6ab8737dc","port":0}]}],"env":[{"name":"controlProperty","type":"str","value":"control","ui":{"label":{"en-US":"Property for OK or FAIL"},"type":"input","opts":{"types":["str","env"]}}},{"name":"OKValue","type":"str","value":"OK","ui":{"label":{"en-US":"Value of success"},"type":"input","opts":{"types":["str","num","bool","env"]}}},{"name":"FAILValue","type":"str","value":"FAIL","ui":{"label":{"en-US":"Value for failure"},"type":"input","opts":{"types":["str","num","bool","env"]}}},{"name":"retrySecs","type":"num","value":"60","ui":{"label":{"en-US":"Retry period (secs)"},"type":"input","opts":{"types":["num","env"]}}},{"name":"maxQueue","type":"num","value":"100","ui":{"label":{"en-US":"Max messages in queue"},"type":"input","opts":{"types":["str","num","env"]}}},{"name":"contextStore","type":"str","value":"default","ui":{"label":{"en-US":"Context Store to use"},"type":"input","opts":{"types":["str","env"]}}}],"color":"#DDAA99","status":{"x":420,"y":160,"wires":[{"id":"ed779289.25b5d8","port":0}]}},{"id":"602725f6.15eee4","type":"inject","z":"149380c1.63e107","name":"Retry ","props":[{"p":"${controlProperty}","v":"__trigger","vt":"str"}],"repeat":"${retrySecs}","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":100,"y":181,"wires":[["62560ae6ab8737dc"]]},{"id":"ed779289.25b5d8","type":"status","z":"149380c1.63e107","name":"","scope":["62560ae6ab8737dc"],"x":300,"y":160,"wires":[[]]},{"id":"62560ae6ab8737dc","type":"function","z":"149380c1.63e107","name":"State machine","func":"let store = env.get(\"contextStore\")\nif (store === \"default\") store = null\nlet stat = context.get(\"stat\", store) || {state: \"initial\", queue: []}\n// can't use a switch here I think as need to compare against env value\nconst control = msg[env.get(\"controlProperty\")]\n\nif (control === env.get(\"OKValue\")) {\n handleOK(stat)\n} else if (control === env.get(\"FAILValue\")) {\n handleFAIL(stat)\n} else if (control === \"__trigger\") {\n handleTrigger(stat)\n} else {\n // no valid control value so must be incoming message\n handleMessage(msg, stat)\n}\n//node.warn(`state: ${stat.state}`)\n// decide what to do next based on the new state\nswitch (stat.state) {\n case \"initial\":\n case \"waitingForMsg\":\n sendMsg(stat) // send next message if any\n break;\n \n case \"waitingForTrigger\":\n case \"waitingForOKFail\":\n // do nothing\n break;\n}\nnode.status( `${stat.queue.length} ${stat.state}` )\ncontext.set(\"stat\", stat, store)\nreturn null;\n\n// Called when message to be queued is received\nfunction handleMessage(msg, stat) {\n //node.warn(\"handleMessage\")\n // push a clone onto the queue\n stat.queue.push(RED.util.cloneMessage(msg))\n // limit number in queue\n const max = Number(env.get(\"maxQueue\"))\n if (!isNaN(max) && max > 0) {\n // max length hit, remove oldest\n if (stat.queue.length > max) stat.queue.shift()\n }\n // Simulate a trigger event to handle any state change needed\n handleTrigger(stat)\n}\n\n// Called to send the next message off the queue if any, but leaves it on queue\nfunction sendMsg(stat) {\n //node.warn(\"sendMsg\")\n let thisMsg = stat.queue[0]\n if (thisMsg) {\n // send a clone\n //node.warn(\"sending\")\n node.send(RED.util.cloneMessage(thisMsg))\n stat.state = \"waitingForOKFail\"\n } else {\n // nothing in queue\n stat.state = \"waitingForMsg\"\n }\n}\n\n// Called when OK response received\nfunction handleOK(stat) {\n //node.warn(\"handleOK\")\n // ignore if in wrong state\n if (stat.state === \"waitingForOKFail\") {\n // OK received so drop the top message \n stat.queue.shift()\n // set the state to waiting for message, which will allow the next one to be sent\n stat.state = \"waitingForMsg\"\n } else {\n node.warn(\"Ignoring unnexpected OK\")\n }\n}\n\n// Called when FAIL response received\nfunction handleFAIL(stat) {\n //node.warn(\"handleFAIL\")\n // ignore if in wrong state\n if (stat.state === \"waitingForOKFail\") {\n // FAIL received so go to waiting for trigger state\n stat.state = \"waitingForTrigger\"\n } else {\n node.warn(\"Ignoring unnexpected FAIL\")\n }\n}\n\n// Called when a trigger message is received or after a new incoming message is queued\nfunction handleTrigger(stat) {\n //node.warn(\"handleTrigger\")\n if (stat.state === \"waitingForTrigger\") {\n //node.warn(\"state to waiting\")\n // set it to watitingForMsg in order to trigger send \n stat.state = \"waitingForMsg\"\n }\n // ignore for other states\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":280,"y":80,"wires":[[]]},{"id":"40032b86.16b0dc","type":"link out","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"","links":["eada5d9a.8c60e"],"x":715,"y":320,"wires":[]},{"id":"9d7e52ff.9373a","type":"change","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"OK","rules":[{"t":"set","p":"control","pt":"msg","to":"OK","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":550,"y":320,"wires":[["40032b86.16b0dc"]]},{"id":"98d72bd3.c5c98","type":"change","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"FAIL","rules":[{"t":"set","p":"control","pt":"msg","to":"FAIL","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":550,"y":360,"wires":[["40032b86.16b0dc"]]},{"id":"78bcff9d.8c29c","type":"inject","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"Send test email","props":[{"p":"payload"},{"p":"topic","vt":"str"},{"p":"to","v":"someone@somewhere.com","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"email subject","payload":"This is the email contents","payloadType":"str","x":340,"y":80,"wires":[["52c5b999.776288"]]},{"id":"eada5d9a.8c60e","type":"link in","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"","links":["40032b86.16b0dc"],"x":175,"y":280,"wires":[["406fad44.dfcbdc"]]},{"id":"87580f77.38e0a","type":"complete","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"","scope":["be8e3686.b3db4"],"uncaught":false,"x":370,"y":320,"wires":[["9d7e52ff.9373a"]]},{"id":"75675144.54ee98","type":"catch","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"","scope":["be8e3686.b3db4"],"uncaught":false,"x":350,"y":360,"wires":[["98d72bd3.c5c98"]]},{"id":"26ef1404.562c74","type":"link in","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"Email delivery","links":["52c5b999.776288"],"x":95,"y":180,"wires":[["406fad44.dfcbdc"]]},{"id":"52c5b999.776288","type":"link out","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"","links":["26ef1404.562c74"],"x":455,"y":80,"wires":[]},{"id":"a246571e.945ae8","type":"comment","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"Send email messages to this link","info":"","x":190,"y":140,"wires":[]},{"id":"406fad44.dfcbdc","type":"subflow:149380c1.63e107","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","name":"Guaranteed delivery","env":[],"x":360,"y":180,"wires":[["be8e3686.b3db4"]]},{"id":"be8e3686.b3db4","type":"e-mail","z":"db2da7ec2cdcbc9c","g":"72e9a4edb56a84a7","server":"smtp.gmail.com","port":"465","authtype":"BASIC","saslformat":false,"token":"","secure":true,"tls":true,"name":"","dname":"","x":350,"y":260,"wires":[]},{"id":"1034d23a3ba16675","type":"group","z":"db2da7ec2cdcbc9c","name":"Publishing to 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