This issue was reported manually by mmirilovic.
It already has 23 duplicates 


Build: NetBeans IDE 6.7.1 (Build 200911211148)
VM: Java HotSpot(TM) Client VM, 16.0-b13, Java(TM) SE Runtime Environment, 1.6.0_18-b07
OS: Windows 7

User Comments:
GUEST: clicked on a horizontal join/fork inside an activity group while linking it to decisions

GUEST: Modeling an uml class diagram. The system has frozen when I created a package and tried to put some classes into it.

GUEST: just moving the folders

GUEST: Tried to make an assocaiation been actor and a package

GUEST: Designing a class diagram.

GUEST: I clicked on the INS button in the lower right hand side.  

I was trying to prevent NetBeans from changing the size of my Parameter Usage Objects in an Activity Diagram.

GUEST: I was trying to put a package underneath some existing objects.  I believe I accidentally moved the package after it enclosed some objects, so they moved as well.  This caused my multiplicity boxes to shift, unfortunately, so I was moving them back when I noticed this exception being reported.  I'm not sure which move operation caused it.




Stacktrace: 
java.lang.NullPointerException
   at org.netbeans.modules.uml.drawingarea.actions.MoveAction.move(MoveAction.java:127)
   at org.netbeans.modules.uml.drawingarea.actions.MoveAction.mouseReleased(MoveAction.java:105)
   at org.netbeans.api.visual.widget.SceneComponent$Operator$3.operate(SceneComponent.java:561)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:276)
   at org.netbeans.api.visual.widget.SceneComponent.mouseReleased(SceneComponent.java:163)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)