Runtime error trying to logout (sometimes when editing a block)

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When trying to edit a block or trying to logout I sometimes get an errror (see attachments).

Anyone got some experience with these kind of errors?

Additional information:
# concrete5 Version
Core Version - 8.1.0
Version Installed - 8.1.0
# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).
# Server Software
Microsoft-IIS/8.5
# Server API
cgi-fcgi
# PHP Version
7.0.29
# PHP Extensions

1 Attachment

 
wentop1936 replied on at Permalink Reply
Thank you very much!!