https://bugs.winehq.org/show_bug.cgi?id=20083
--- Comment #8 from ray@rh-software.com --- (In reply to Aaron Franke from comment #7)
Is this still an issue in Wine 2.6?
Yes, but the value passed in is not NULL rather than 0x66666666.
With the test program attached to https://bugs.winehq.org/show_bug.cgi?id=42828 then wine seems to crash.