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Comparison method violates its general contract! error

Jailer 3 weeks ago 0

I'm having a bit of trouble with the database. It seems that some items that were once showing up in the UI no longer do. The full error I'm getting in the logs is as follows:

WARN com.ubooquity.fileformat.pdf.b - Problem while reading file: /media/American Rifleman/nra_ar_201806.pdf
java.lang.IllegalArgumentException: Comparison method violates its general contract!

This is only happening for some items not all of them. If you click on one of the items I get a page not found error displayed. Not sure exactly when this started happening or what to do to fix it. Any help would be appreciated. Running this in a jail on my FreeNAS server if it matters.