Custom property name "onColor" cause application to crash

I have one Qt/QML application that works ok in Qt 4.7.3, but crashed in Qt 4.7.x.

I found out that reason for the crash with Qt 4.7.x was name of one custom property in rectangle element. Name of custom property that caused the crash with Qt 4.7.x was "onColor".

property color onColor

For example if I changed property name to "onFoo" application did not crash.

Example application OnColorCrash added as attachment.