Begin of the insertion### **Environment**:

Your OpenProject Version: 11.1.1 / Enterprise on-premises

Operating System / Browser / OpenProject language: Browser: e.g. Firefox

### **Logs**

The logs did not show anything. Browser console:

\---BEGIN--- 
Uncaught Error: Uncaught (in promise): CKEditorError: [e.id](http://e.id/) is undefined 
Read more: [https://ckeditor.com/docs/ckeditor5/latest/framework/guides/support/error-codes.html#error-e.id](https://ckeditor.com/docs/ckeditor5/latest/framework/guides/support/error-codes.html#error-e.id) is undefined 
view@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:874110 attributeToElement/</</</<@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:380242 fire@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:226568 \_testAndFire@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:363835 \_convertInsertWithAttributes@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:364204 convertInsert@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:360591 convertChanges@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:359928 fa/</<@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:392351 change@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:330834 fa/<@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:392316 fire@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:226568 \_handleChangeBlock@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:453167 \_runPendingChanges@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:472231 enqueueChange@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:469238 init@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:411698 decorate/<@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:255575 fire@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:226568 decorate/this\[e\]@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:255626 create/</<@https://OPENPROJECTFQDN/assets/frontend/core-vendor-ckeditor-ckeditor-js.2701c38f34b52cce85b0.js:1:512393 invoke@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:6751 onInvoke@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:2010391 invoke@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:6691 run@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:2159 N/<@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:13190 invokeTask@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:7369 onInvokeTask@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:2010280 invokeTask@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:7290 runTask@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:2774 m@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:9389 S@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:718894 v/<@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:716974 p@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:716778 invoke@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:6751 runGuarded@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:2282 wrap/<@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:2061 MutationCallback\*j/k\[e\]@https://OPENPROJECTFQDN/assets/frontend/polyfills.d0b35e283d8dea4e51cf.js:1:18282 r@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:717177 E2g8@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:722101 r@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:561 /ur0@https://OPENPROJECTFQDN/assets/frontend/vendor.4a7dfb7efff28bb69fe2.js:1:232023 r@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:561 GDA9@https://OPENPROJECTFQDN/assets/frontend/main.45ddc8e4d6246b4368ee.js:1:266410 r@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:561 zUnb@https://OPENPROJECTFQDN/assets/frontend/main.45ddc8e4d6246b4368ee.js:1:1305765 r@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:561 0@https://OPENPROJECTFQDN/assets/frontend/main.45ddc8e4d6246b4368ee.js:1:16695 r@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:561 c@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:430 d@https://OPENPROJECTFQDN/assets/frontend/runtime.deb698e61f75f2ad9366.js:1:293 @https://OPENPROJECTFQDN/assets/frontend/main.45ddc8e4d6246b4368ee.js:1:47 
Angular 8 
S es6-promise.js:408 
v es6-promise.js:176 
p es6-promise.js:126 
Angular 4 
r es6-promise.js:95
E2g8 es6-promise.js:10
Webpack 12
zone-evergreen.js:798:38 
Angular 8 
S es6-promise.js:408 
v es6-promise.js:176 
p es6-promise.js:126 
Angular 4 
r es6-promise.js:95 
E2g8 es6-promise.js:10 
Webpack 12 
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### **Steps to reproduce:**

1. Go to some Wiki pages (unclear why some are affected and some are not)
2. Click on "Edit"

### **Actual Behavior**

The editor does not load properly, Wiki articles can't be changed

### **Expected Behavior**

Editor loads, Wiki can be editedEnd of the insertion