Assertion 'ObjHead->cLockObj >= 1

Software affected: K-Meleon 1.5.4 portable
Happens after you close the program.

Debug log:

Assertion 'ObjHead->cLockObj >= 1' failed at /srv/buildbot_cmake/full_cmake/build/win32ss/user/ntuser/object.c line 591

Entered debugger on embedded INT3 at 0x0008:0x8095b5e2.
kdb:> bt
Eip:
<NTOSKRNL.EXE:15b5e3 (:0 (DbgBreakPoint))>
Frames:
<win32k.sys:8061a (win32ss/user/ntuser/object.c:591 (UserDereferenceObject))>
<win32k.sys:4dae1 (win32ss/user/ntuser/menu.c:206 (IntDestroyMenu))>
<win32k.sys:4d9aa (win32ss/user/ntuser/menu.c:233 (IntDestroyMenuObject))>
<win32k.sys:5062b (win32ss/user/ntuser/menu.c:2089 (NtUserDestroyMenu))>
<NTOSKRNL.EXE:143e40 (ntoskrnl/include/internal/i386/ke.h:689 (KiSystemServiceHandler))>
<NTOSKRNL.EXE:3d95 (:0 (KiFastCallEntry))>
<ntdll.dll:c761>
<k-meleon.exe:1b603>
<k-meleon.exe:1b5e0>
<k-meleon.exe:1ba03>
<k-meleon.exe:5c7e8>
<MSVCR71.dll:8d0c>
<kernel32.dll:fbe3>
<00000000>
kdb:> cont

Entered debugger on embedded INT3 at 0x0008:0x8095b5e2.
kdb:> cont

Entered debugger on last-chance exception (Exception Code: 0xc0000005) (Page Fault)
Memory at 0x6C650264 could not be written: Page not present.
kdb:> cont

• • • Fatal System Error: 0x0000001e
      (0xC0000005,0x80961020,0xF6AC2B7C,0x00000000)

Entered debugger on embedded INT3 at 0x0008:0x8095b5e8.
kdb:> cont
(ntoskrnl/ke/bug.c:600) Potentially unloaded driver!
(ntoskrnl/ke/bug.c:600) Potentially unloaded driver!
(ntoskrnl/ke/bug.c:600) Potentially unloaded driver!

Entered debugger on embedded INT3 at 0x0008:0x8095b5e8.
kdb:>