- XtRemoveEventHandler( frameShell, StructureNotifyMask,
- False, (XtEventHandler)wxFrameMapProc,
- (XtPointer)this );
+ if( frameShell )
+ XtRemoveEventHandler( frameShell, StructureNotifyMask,
+ False, (XtEventHandler)wxFrameMapProc,
+ (XtPointer)this );