Strange Glib messages

[Paul]

Hello everyone,

When I shut down XFCE, I see loads and loads of the same error message
repeated on the console:

Glib-CRITICAL: file gstrfuncs.c  line 1194 (g_strcasecomp): assertion 's1 !=
NULL' failed.

Can anyone tell me what this is, and the more: what can I do to fix this? I
do not like messages with the word 'critical' in them.
I don't know if it is XFCE that puts out this message, or another program.

Thank you!
Paul

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