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An exception occurs when drawing a connector using the port draw.
Create a diagram with node and set a port to the node
Add the port draw constraints.
Try to drag the connector on the port, an exception will raise.
The reported issue is while creating a connector when clicking on the port, we have sent a call from the client to the server with the update diagram object data and again the server sends the call and updates the drawing object as null on the client-side. so the reported exception will arrive, we need to fix this issue.