Plugin update loop (MovieDb, Bluray Folder Support)

[cfan4tic 5]

Hello, I'm running an Emby installation as a Docker container on a x86 Intel-based QNAP NAS. Emby version 4.9.1.90 is installed.

According to the dashboard, the problem is that every 15 minutes, the MovieDb and Blu-ray Folder Support plugins are downloaded and updated in the background. A message appears instructing me to restart the Emby server to complete the plugin installation. This process then repeats itself because the plugins cannot currently be updated properly.

I reviewed the log files. They show that the two plugins are being downloaded cyclically from a web address. However, when the server restarts, an exception related to the plugins is thrown, and the previous version is copied back, and this happens in an endless loop.

I work in IT and have some experience with Docker containers. File system permissions have been checked, everything is fine, and the plugin DLLs can be read by the Emby process. The MD5 checksums of the two faulty plugins are:

• MovieDb Version 1.8.9 - MovieDb.dll 2a1d234412fbd592ff6aa2ef3bb4aa42
• Bluray Folder Support Version 1.0.5 - BlurayMounter.dll 379ae4266c14c13fdd2017dc9773b6b6

Are these plugin DLLs valid compared to other environments? Is it possibly a QNAP-specific issue?

See attached log excerpt.

embyserver.txt

[Neminem 1515]

I would try removing the plugin, restart.

Then install the plugin again.

And see what happens.

[Luke 42077]

I was also going to suggest installing the server again on top of your existing installation. I would try both of these things.

[cfan4tic 5]

That actually solved my problem. Both plugins are working now. I guess the DLL files were corrupt, the MD5 checksums did change after reinstallation.

[Neminem 1515]

What exactly did you do?

Reinstall Emby server.

Or delete plugins ?

[cfan4tic 5]

I removed and reinstalled the two plugins because that was the minor change. This already fixed the problem.
To be precise and potentially help others, the exact error message from the log was:
 

2026-01-07 13:11:55.469 Error App: Error retrieving version number of /config/plugins/BlurayMounter.dll
*** Error Report ***
Version: 4.9.1.90
Command line: /app/emby/system/EmbyServer.dll -programdata /config -ffdetect /app/emby/bin/ffdetect -ffmpeg /app/emby/bin/ffmpeg -ffprobe /app/emby/bin/ffprobe -restartexitcode 3
Operating System: Linux Version 5.10.60-qnap (root@Q64-102-92) (x86_64-QNAP-linux-gnu-gcc (Toolchain configuration: [gcc-4.9.2 binutils-2.25] glibc-2.21]) 4.9.2, GNU ld (GNU Bi)
OS/Process: x64/x64
Framework: .NET 8.0.11
Runtime environment: app/emby/system/System.Private.CoreLib.dll
Number of processors: 12
Data path: /config
Application path: /app/emby/system
System.ArgumentNullException: Value cannot be null. (Parameter 'input')

I searched myself in older posts but did not find similar errors. Maybe this System.ArgumentNullException can give others a hint how to fix it.