# Deploy failed: {"code":"unexpected\_error","message":"Cannot read property 'rev' of null"}

**URL:** <https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602>\
**Category:** General\
**Created:** [12 February 2020 14:43 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602 "2020-02-12T14:43:58Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![gingerhelp](https://avatars.discourse-cdn.com/v4/letter/g/dc4da7/32.png) [@gingerhelp](https://discourse.nodered.org/u/gingerhelp)\
**Post date:** [12 February 2020 14:43 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602/1 "2020-02-12T14:43:58Z")

</div>

Hello,

I am working on a storage plugin for Microsoft SQL Server inspired by this project:

> **[adibenmati/node-red-mongo-storage-plugin](https://github.com/adibenmati/node-red-mongo-storage-plugin)**
>
> Node Red Mongo Storage Plugin. Contribute to adibenmati/node-red-mongo-storage-plugin development by creating an account on GitHub.

It was a fairly straight forward translation but I am running into a snag I was hoping somebody could point me in the right direction on. When I start Node-RED with my plugin in place I will see it fire getSettings, saveSettings, getFlows, getCredentials, and saveSettings again. During this time I will see my empty table structure for NodeRedSettings within SQL Server filled with a row that looks like this:

{  
"nodes":{  
"node-red":{  
"name":"node-red",  
"version":"1.0.3-git",  
"local":false,  
"nodes":{  
"inject":{  
"name":"inject",  
"types":[  
"inject"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/20-inject.js"  
},  
"debug":{  
"name":"debug",  
"types":[  
"debug"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/21-debug.js"  
},  
"complete":{  
"name":"complete",  
"types":[  
"complete"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/24-complete.js"  
},  
"catch":{  
"name":"catch",  
"types":[  
"catch"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/25-catch.js"  
},  
"status":{  
"name":"status",  
"types":[  
"status"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/25-status.js"  
},  
"link":{  
"name":"link",  
"types":[  
"link in",  
"link out"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/60-link.js"  
},  
"comment":{  
"name":"comment",  
"types":[  
"comment"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/90-comment.js"  
},  
"unknown":{  
"name":"unknown",  
"types":[  
"unknown"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/common/98-unknown.js"  
},  
"function":{  
"name":"function",  
"types":[  
"function"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/10-function.js"  
},  
"switch":{  
"name":"switch",  
"types":[  
"switch"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/10-switch.js"  
},  
"change":{  
"name":"change",  
"types":[  
"change"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/15-change.js"  
},  
"range":{  
"name":"range",  
"types":[  
"range"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/16-range.js"  
},  
"template":{  
"name":"template",  
"types":[  
"template"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/80-template.js"  
},  
"delay":{  
"name":"delay",  
"types":[  
"delay"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/89-delay.js"  
},  
"trigger":{  
"name":"trigger",  
"types":[  
"trigger"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/89-trigger.js"  
},  
"exec":{  
"name":"exec",  
"types":[  
"exec"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/function/90-exec.js"  
},  
"tls":{  
"name":"tls",  
"types":[  
"tls-config"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/05-tls.js"  
},  
"httpproxy":{  
"name":"httpproxy",  
"types":[  
"http proxy"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/06-httpproxy.js"  
},  
"mqtt":{  
"name":"mqtt",  
"types":[  
"mqtt in",  
"mqtt out",  
"mqtt-broker"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/10-mqtt.js"  
},  
"httpin":{  
"name":"httpin",  
"types":[  
"http in",  
"http response"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/21-httpin.js"  
},  
"httprequest":{  
"name":"httprequest",  
"types":[  
"http request"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/21-httprequest.js"  
},  
"websocket":{  
"name":"websocket",  
"types":[  
"websocket in",  
"websocket out",  
"websocket-listener",  
"websocket-client"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/22-websocket.js"  
},  
"tcpin":{  
"name":"tcpin",  
"types":[  
"tcp in",  
"tcp out",  
"tcp request"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/31-tcpin.js"  
},  
"udp":{  
"name":"udp",  
"types":[  
"udp in",  
"udp out"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/network/32-udp.js"  
},  
"CSV":{  
"name":"CSV",  
"types":[  
"csv"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/parsers/70-CSV.js"  
},  
"HTML":{  
"name":"HTML",  
"types":[  
"html"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/parsers/70-HTML.js"  
},  
"JSON":{  
"name":"JSON",  
"types":[  
"json"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/parsers/70-JSON.js"  
},  
"XML":{  
"name":"XML",  
"types":[  
"xml"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/parsers/70-XML.js"  
},  
"YAML":{  
"name":"YAML",  
"types":[  
"yaml"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/parsers/70-YAML.js"  
},  
"split":{  
"name":"split",  
"types":[  
"split",  
"join"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/sequence/17-split.js"  
},  
"sort":{  
"name":"sort",  
"types":[  
"sort"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/sequence/18-sort.js"  
},  
"batch":{  
"name":"batch",  
"types":[  
"batch"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/sequence/19-batch.js"  
},  
"file":{  
"name":"file",  
"types":[  
"file",  
"file in"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/storage/10-file.js"  
},  
"watch":{  
"name":"watch",  
"types":[  
"watch"  
],  
"enabled":true,  
"local":false,  
"module":"node-red",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/@node-red/nodes/core/storage/23-watch.js"  
}  
}  
},  
"node-red-node-pi-gpio":{  
"name":"node-red-node-pi-gpio",  
"version":"1.0.6",  
"local":false,  
"nodes":{  
"rpi-gpio":{  
"name":"rpi-gpio",  
"types":[  
"rpi-gpio in",  
"rpi-gpio out",  
"rpi-mouse",  
"rpi-keyboard"  
],  
"enabled":true,  
"local":false,  
"module":"node-red-node-pi-gpio",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/node-red-node-pi-gpio/36-rpi-gpio.js"  
}  
}  
},  
"node-red-node-rbe":{  
"name":"node-red-node-rbe",  
"version":"0.2.8",  
"local":false,  
"nodes":{  
"rbe":{  
"name":"rbe",  
"types":[  
"rbe"  
],  
"enabled":true,  
"local":false,  
"module":"node-red-node-rbe",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/node-red-node-rbe/rbe.js"  
}  
}  
},  
"node-red-node-tail":{  
"name":"node-red-node-tail",  
"version":"0.0.3",  
"local":false,  
"nodes":{  
"tail":{  
"name":"tail",  
"types":[  
"tail"  
],  
"enabled":true,  
"local":false,  
"module":"node-red-node-tail",  
"file":"/Users/adamellis/Documents/src/ginger-iot-webapp/node\_modules/node-red-node-tail/28-tail.js"  
}  
}  
}  
},  
"_credentialSecret":"HIDDEN",  
"users":{  
"_":{  
"editor":{  
"view":{  
"view-show-grid":true,  
"view-snap-grid":true,  
"view-grid-size":20,  
"view-node-status":true,  
"view-node-show-label":true,  
"view-show-tips":true  
}  
}  
}  
}  
}

So far so good - then I load the dashboard up and build a flow (there is not the typical default 'Flow 1' so I need to create one). When I go to deploy I am getting this error and do not see any of the storage methods being called:

Deploy failed: {"code":"unexpected\_error","message":"Cannot read property 'rev' of null"}

Any ideas of where to start looking?

Thanks in advance,  
Adam

\*post edited for readability and a slight tweak to my plugin code

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<div class="post-metadata">

**Author:** ![knolleary](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/knolleary/32/3_2.png) [@knolleary](https://discourse.nodered.org/u/knolleary)\
**Post date:** [12 February 2020 15:28 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602/2 "2020-02-12T15:28:02Z")

</div>

Hi @gingerhelp

Off the top of my head, I can't think what would cause that particular error. The fact you don't get a default Flow 1 is curious.

As a guess, I can see your code will return undefined for `getFlows` if there's nothing there. I would change that to return `[]` rather than `undefined`.

As an aside, I note your are using `node-red-mongo-storage-plugin` as the module name. We do kindly ask that if a node is going to use `node-red` at the start of its name, that it uses `node-red-contrib-` as their prefix to distinguish it from the modules the core project maintains.

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<div class="post-metadata">

**Author:** ![gingerhelp](https://avatars.discourse-cdn.com/v4/letter/g/dc4da7/32.png) [@gingerhelp](https://discourse.nodered.org/u/gingerhelp)\
**Post date:** [12 February 2020 15:30 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602/3 "2020-02-12T15:30:28Z")

</div>

Thank you! Changing getFlows to return`[]` rather than undefined fixed my issues. And noted on the module name - I will get this out there shortly.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [26 February 2020 15:30 UTC](https://discourse.nodered.org/t/deploy-failed-code-unexpected-error-message-cannot-read-property-rev-of-null/21602/4 "2020-02-26T15:30:29Z")

</div>

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