Windows, SDK 2.0.0 and 2.0.1, reported by both myself and joyrider3774:
A band-aid (sledgehammer) that used to work (it's been a while since I worked with the framework) to shut this sort of stuff up would be to add this to the top/entry of the method with the issue:
:
wxLogNull logNo; // suppress wxLog error messages within this scope...
:
... that, or figure out what it takes to satisfy the assert condition 
Let us know what it turned out to be... inquiring minds want to know! 
This is a known issue and will be fixed in the next release, thanks for the report!
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