QuickBall example crashes after hitting the first target

QuickBall example crashes after hitting the first target. The error is a read access violation which happens in the internalPick function of the View3D component.

Analysis : 

After hitting a target the hitAnimation inside the qml is started and at the end in runs a script to destroy the Node. When the internalPick function tries to access the frontEndObject of this Node it is destroyed by this time and the application crashes. Commenting the script inside the qml at line 410 makes the application does not crash