# Nodered 5.0 Editor fails open Function Tab
**URL:** https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248
**Category:** General
**Tags:** function-node, dashboard-2
**Created:** [10 June 2026 11:45 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248 "2026-06-10T11:45:06Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Hubertus](https://discourse.nodered.org/u/Hubertus)
#### Post date: [10 June 2026 11:45 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/1 "2026-06-10T11:45:06Z")
Hello.
when I reload Node-RED in the browser, I can edit a function node.
If I close the node and want to edit it again—or any other function node—the editor doesn't appear.
Only after reloading Node-RED in the browser can a single function node be edited once. Then I have to reload again. Tested with Chrome and Internet Explorer.
Best regards
Hubertus
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [10 June 2026 12:00 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/2 "2026-06-10T12:00:14Z")
Can you check your browsers dev tools console for errors and let us know please.
---
### Author:  [@Hubertus](https://discourse.nodered.org/u/Hubertus)
#### Post date: [10 June 2026 12:08 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/3 "2026-06-10T12:08:53Z")
This appears after double-clicking the function node.
Is that what you meant?
```auto
inject.js:101 [Violation] Added non-passive event listener to a scroll-blocking 'mousewheel' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952
l @ inject.js:101
add @ vendor.js?v=730435635d59:2
(anonymous) @ vendor.js?v=730435635d59:3
(anonymous) @ vendor.js?v=730435635d59:3
(anonymous) @ vendor.js?v=730435635d59:2
each @ vendor.js?v=730435635d59:2
each @ vendor.js?v=730435635d59:2
Le @ vendor.js?v=730435635d59:2
on @ vendor.js?v=730435635d59:2
(anonymous) @ vendor.js?v=730435635d59:8
each @ vendor.js?v=730435635d59:2
_on @ vendor.js?v=730435635d59:8
_create @ vendor.js?v=730435635d59:8
(anonymous) @ vendor.js?v=730435635d59:8
_createWidget @ vendor.js?v=730435635d59:8
(anonymous) @ vendor.js?v=730435635d59:8
(anonymous) @ vendor.js?v=730435635d59:8
each @ vendor.js?v=730435635d59:2
each @ vendor.js?v=730435635d59:2
(anonymous) @ vendor.js?v=730435635d59:8
oneditprepare @ VM309:389
H @ red.min.js?v=730435635d59:97
y @ red.min.js?v=730435635d59:97
open @ red.min.js?v=730435635d59:97
t @ red.min.js?v=730435635d59:179
show @ red.min.js?v=730435635d59:179
_ @ red.min.js?v=730435635d59:97
Ui @ red.min.js?v=730435635d59:97
i @ vendor.js?v=730435635d59:26
red.min.js?v=730435635d59:97 oneditprepare 5d19664d4281f23f function TypeError: Assignment to constant variable.
red.min.js?v=730435635d59:97 TypeError: Assignment to constant variable.
at Object.L [as create] (red.min.js?v=730435635d59:171:11)
at Object.B [as create] (red.min.js?v=730435635d59:98:2756)
at Object.createEditor (red.min.js?v=730435635d59:97:252369)
at buildEditor (:410:43)
at Proxy.oneditprepare (:443:31)
at H (red.min.js?v=730435635d59:97:225399)
at y (red.min.js?v=730435635d59:97:226352)
at Object.open (red.min.js?v=730435635d59:97:235561)
at t (red.min.js?v=730435635d59:179:3187)
at Object.show (red.min.js?v=730435635d59:179:4562)
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
vendor.js?v=730435635d59:26 [Violation] 'mouseup' handler took 166ms
5
[Violation] Forced reflow while executing JavaScript took ms
[Violation] Forced reflow while executing JavaScript took 31ms
[Violation] Forced reflow while executing JavaScript took 45ms
[Violation] Forced reflow while executing JavaScript took 49ms
[Violation] Forced reflow while executing JavaScript took 30ms
[Violation] Forced reflow while executing JavaScript took 273ms
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:179 [Violation] 'setTimeout' handler took 83ms
red.min.js?v=730435635d59:97 oneditresize 5d19664d4281f23f function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:16 [Violation] 'message' handler took 177ms
red.min.js?v=730435635d59:16 [Violation] 'message' handler took 581ms
```
---
### Author:  [@Hubertus](https://discourse.nodered.org/u/Hubertus)
#### Post date: [10 June 2026 13:06 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/4 "2026-06-10T13:06:01Z")
Maybe that's another clue—when I change the editor from Monaco to Ace in the settings.js file, everything works fine.
But the coding competition is a lost cause—no way
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [10 June 2026 13:44 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/5 "2026-06-10T13:44:59Z")
I am not seeing this. in my browser.
What browser (and version) are you using?
Regarding, the error, `red.min.js?v=730435635d59:97 TypeError: Assignment to constant variable.` can you click on this and capture the code above and below this - there may be a bug.
---
### Author:  [@Hubertus](https://discourse.nodered.org/u/Hubertus)
#### Post date: [10 June 2026 14:26 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/6 "2026-06-10T14:26:52Z")
First the console log:
```auto
TypeError: Assignment to constant variable.
at Object.L [as create] (red.min.js:171:11)
at Object.B [as create] (red.min.js:98:2756)
at Object.createEditor (red.min.js:97:252369)
at buildEditor (:410:43)
at Proxy.oneditprepare (:443:31)
at H (red.min.js:97:225399)
at y (red.min.js:97:226352)
at Object.open (red.min.js:97:235561)
at t (red.min.js:179:3187)
at Object.show (red.min.js:179:4562)
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
9red.min.js?v=730435635d59:97 oneditresize 8627ce70dce21743 function TypeError: Cannot read properties of undefined (reading 'resize')
```
see "undefined (reading resize)"
the code:
```auto
RED.editor.registerEditPane("editor-tab-properties", function(x) {
return {
label: RED._("editor-tab.properties"),
name: RED._("editor-tab.properties"),
iconClass: "fa fa-cog",
create: function(k) {
var b = x.type;
x.type === "subflow" ? b = "subflow-template" : x.type.substring(0, 8) == "subflow:" && (b = "subflow");
var t;
x._def.set.module === "node-red" ? t = "node-red" : t = x._def.set.id;
var g = "dialog-form";
this.inputClass = "node-input",
x._def.category === "config" && b !== "group" ? (this.inputClass = "node-config-input",
g = "node-config-dialog-edit-form") : x.type === "subflow" && (this.inputClass = "subflow-input"),
RED.editor.buildEditForm(k, g, b, t, x)
},
resize: function(k) {
if (x && x._def.oneditresize)
try {
x._def.oneditresize.call(x, k)
} catch (b) {
console.log("oneditresize", x.id, x.type, b.toString())
}
},
close: function() {},
apply: function(k) {
var b, t;
if (x._def.defaults) {
for (t in x._def.defaults)
if (x._def.defaults.hasOwnProperty(t)) {
var g = $("#" + this.inputClass + "-" + t);
if (g.attr("type") === "checkbox" ? b = g.prop("checked") : g.prop("nodeName") === "select" && g.attr("multiple") === "multiple" ? (b = g.val(),
b == null && (b = [])) : "format"in x._def.defaults[t] && x._def.defaults[t].format !== "" && g[0].nodeName === "DIV" ? b = g.text() : b = g.val(),
b != null) {
if (t === "outputs") {
if (b.trim() === "")
continue;
if (isNaN(b)) {
```
My browsers to test this:
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [19 June 2026 08:22 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/7 "2026-06-19T08:22:45Z")
For anyone following along: [Unable to edit function node when using monaco · Issue #5834 · node-red/node-red · GitHub](https://github.com/node-red/node-red/issues/5834#issuecomment-4749803208)
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [17 September 2026 08:23 UTC](https://discourse.nodered.org/t/nodered-5-0-editor-fails-open-function-tab/101248/8 "2026-09-17T08:23:35Z")
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