Nextcloud: Error: TypeError: b.sidebar is null

[benchonaut]

Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe the bug
Error: TypeError: b.sidebar is null prevents everything from happening.

To Reproduce

• install nextcloud
• setup drawio , proper SSL , including cors etc.
• open a file or try to create a new one
• message pops up

Expected behavior
thingy working ( did it before )

Screenshots

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version [e.g. 12.6.7]:

• ( no menu )
• current drawio docker image
• image-exporter built from "regular" dockerfile

FROM node:lts-slim

LABEL maintainer="JGraph Ltd"

RUN apt-get update -y && \
    apt-get install -y --no-install-recommends \
        git curl software-properties-common chromium libatk-bridge2.0-0 libgtk-3-0 && \
    apt-add-repository contrib && \
    apt-get update -y && \
    apt-get install -y --no-install-recommends \
        ttf-mscorefonts-installer && \
    mkdir /usr/local/drawio && \
    cd /usr/local/drawio && \
    git clone https://github.com/jgraph/draw-image-export2.git && \
    cd draw-image-export2 && \
    npm install && \
    apt-get remove -y --purge chromium git

WORKDIR /usr/local/drawio/draw-image-export2

EXPOSE 8000

CMD ["npm", "start"]

)

Desktop (please complete the following information):

• OS: any
• Browser firefox/chrome engine
• Version: any

Smartphone (please complete the following information):
^^ same

Additional context

• tried with and without offline mode
• tried with and without dark/auto/light
• tried with themes classic/modern/minimal
  -> javascript is 200 OK for all resources
  

[davidjgraph]

Is this still happening on latest docker?

[benchonaut]

good joke , ...

in fact , even with all updates installed one can only create a new file ,
re-opening always shows blank previews

Is this still happening on latest docker? -> of course

---

[davidjgraph]

User banned for breaching code of conduct.