Comment 2 for bug 1045191

StacktraceTop:
 __assert_fail_base (fmt=<optimized out>, assertion=0x7f1c84565e58 "px != 0", file=0x7f1c84565e28 "/usr/include/boost/smart_ptr/shared_ptr.hpp", line=<optimized out>, function=<optimized out>) at assert.c:94
 __GI___assert_fail (assertion=0x7f1c84565e58 "px != 0", file=0x7f1c84565e28 "/usr/include/boost/smart_ptr/shared_ptr.hpp", line=424, function=0x7f1c8456a0e0 "T* boost::shared_ptr<T>::operator->() const [with T = CompRect]") at assert.c:103
 boost::shared_ptr<CompRect>::operator-> (this=<optimized out>) at /usr/include/boost/smart_ptr/shared_ptr.hpp:424
 ResizeLogic::enableOrDisableVerticalMaximization (this=this@entry=0x26d2f58, yRoot=yRoot@entry=340) at /build/buildd/compiz-0.9.8.0/plugins/resize/src/logic/src/resize-logic.cpp:1112
 ResizeLogic::handleMotionEvent (this=this@entry=0x26d2f58, xRoot=515, yRoot=340) at /build/buildd/compiz-0.9.8.0/plugins/resize/src/logic/src/resize-logic.cpp:498