MinimServer, booklet and BubbleUPnP Server

[meisbedi]

Im using a combination of MinimServer, my own Control Point and BubbleUPnP Server as an Open Home Renderer. After I activated the booklet feature, I noticed, that all the tracks, that had booklet information inside the metadata did not play with BubbleUPnP Server anymore. BubbleUPnP Server reports the http error code "500: Internal Server Error".
I'm using the following setting in tagFormat: Comment.displayFormat={$*infoFileURI^<a href="^"></a>$comment^^^/ }.
I checked the metadata, that are sent by Minimserver, and they are correct.
I also cross checked the behavior with the Lumin App, and I can replicate the problem.
If I control my renderer (PS Audio bridge II) directly, bypassing BubbleUPNP Server, the file plays without a problem.
As a workaround, I remove the information related to the booklet link, and all the files are playing again.

Hopefully, this helps anybody else experiencing similar issues to understand what is going on, until a fix is available for either MinimServer or BubbleUPnP Server.