Issue very similar to #1179 when I googled.
Raspberry Pi 5 arm64
Server: Linux x 6.12.25+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.25-1+rpt1 (2025-04-30) aarch64 GNU/Linux
On Docker-ce
Client: Firefox 138 on MacOS.
I just did a clean install from the instructions here: https://hub.docker.com/r/linuxserver/heimdall/
It installed version 2.6.3.
Steps (bold line explained later below):
- Click on "Add an application" in main page
- In Preview page, click Application Type and choose one. My choice was XWiki
- Then, click on "Website" just under that, and add a website (http://...) and click Go
- It asks to select an icon, gives me 3 choices. I select any of them (all have same outcome)
- Click on Save on the bottom.
Result:
- It gives an error saying "Icon must be an image"
- It then refreshes that same page, and all images are broken (see attached).
Unable to proceed with creating an application.

img src for the top broken image looks strange.
"src="http://myhost.lan/storage/http://mywiki.lan/resources/icons/xwiki/favicon16.png?cache-version=1741704314000""
Same with bottom one next to "Upload an icon"
http://myhost.lan/storage/http://mywiki.lan/resources/icons/xwiki/favicon16.png?cache-version=1741704314000
Note:
The issue that breaks this is the one in bold above.
- If I click on "Website", and add the URL there and it populates the rest of the preview page, then it breaks when I click Save. However
- If I don't click on Website, and just enter the URL myself in the URL box mid-page, click on Save, that works and the Application is created.
Issue very similar to #1179 when I googled.
Raspberry Pi 5 arm64
Server: Linux x 6.12.25+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.25-1+rpt1 (2025-04-30) aarch64 GNU/Linux
On Docker-ce
Client: Firefox 138 on MacOS.
I just did a clean install from the instructions here: https://hub.docker.com/r/linuxserver/heimdall/
It installed version 2.6.3.
Steps (bold line explained later below):
Result:
Unable to proceed with creating an application.
img src for the top broken image looks strange.
"src="http://myhost.lan/storage/http://mywiki.lan/resources/icons/xwiki/favicon16.png?cache-version=1741704314000""
Same with bottom one next to "Upload an icon"
http://myhost.lan/storage/http://mywiki.lan/resources/icons/xwiki/favicon16.png?cache-version=1741704314000
Note:
The issue that breaks this is the one in bold above.