the application dock does not have permission to open (null)

This worked for the Application digikam (version 8.5.0) on macos 15.1.1 on my intel imac 27 (2020)

Yup, good shout, works for me, fixes the error when launching UniFi.app

Thanks!

SOLVED (for my case): After updating to 15.1, I had this problem, too. However, note that my case is: I have self-written, unsigned java apps in the Dock. These Apps are xxx.app folders with Contents/ and in there is also a self-written Info.plist file. This Info.plist contained too many entries, partly with no/incorrect data. Removing most of them and only using CFBundleExecutable, CFBundleIconFile, CFBundleDisplayName solved my problem. However, for my case here, the main executable is merely a shell script in the MacOS folder, so for your problem that may be more complicated. In any case, it might help to look into the Info.plist file and try to fix (or remove) something there.