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An exception accrues when adding the HTML node to the diagram using the drop event. create a diagram with a symbol palette and add the drop event to the diagram. when drag and drop node from palette cancel the exiting node addition and add the HTML node instead of on that dropped a place. when performing the drag and drop a node from the palette to diagram continuously, we sometimes get the following attached exception. we need to fix that issue.
The reported issue does not take place all the time and it takes place when adding the HTML nodes using drop event.