Error pressing undo after dragging and dropping a node

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The error appears when I try to revert a drag and drop step in the tree node. 
If I select a node and it has a child node with a TrakerHeliostat or a node 
with a TShapekit, I move it using the drag and drop "tool" and then I press the 
button undo the program crashes. 
This problem not allways appears so I can't assure why this problem appears.

Original issue reported on code.google.com by sergio.g...@gmail.com on 7 Sep 2011 at 8:39

[GoogleCodeExporter]

Original comment by sergio.g...@gmail.com on 7 Sep 2011 at 10:19

• Changed title: Error pressing undo after dragging and dropping a node

[GoogleCodeExporter]

The problem has been solved. Sometimes there was an instance to a null pointer 
when the tree was being updated so that the program has crashed.

Original comment by sergio.g...@gmail.com on 12 Sep 2011 at 3:58

• Changed state: Fixed