bogus timer id in wxTimerProc

I'm curious about what the following error means:
PyAssertionError: C++ assertion "node != TimerMap().end()" failed at
..\..\src\msw\timer.cpp(158) in wxTimerProc(): bogus timer id in
wxTimerProc

>From the little I could learn about this error from searching around
it seems like this might happen if a timer is started from a different
thread.

I'm seeing in this on Windows XP with wxPython  2.8.7.1

Anyone else have any light they could shed on what would generate this
assertion?

Thanks,
--Mark
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