Crash when setting a cpp property in an Export item without depending on the cpp module

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Resolving project for configuration qt-4-8-5-debug
Process 18515 stopped
* thread #5: tid = 0x319ad6a, 0x000000010018333c libqbscore.1.1.0.dylib`qbs::Internal::FileContext::idScope(this=0x0000000000000000) const + 12 at filecontext.h:81, name = 'QThread, stop reason = EXC_BAD_ACCESS (code=1, address=0x18)
    frame #0: 0x000000010018333c libqbscore.1.1.0.dylib`qbs::Internal::FileContext::idScope(this=0x0000000000000000) const + 12 at filecontext.h:81
   78  	
   79  	inline Item *FileContext::idScope() const
   80  	{
-> 81  	    return m_idScope;
   82  	}
   83  	
   84  	} // namespace Internal