UnicodeDecodeError related to avatars

Versions

• OS: Windows 10
• GTK Version: 3.24.23
• PyGObject Version: 3.38.0
• GLib Version : 2.66.2
• python-nbxmpp Version: 1.91.0
• Gajim Version: 1.2.91

Traceback

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbb in position 25: invalid start byte

Steps to reproduce the problem

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