Add null check to Engine.setupChat() #2
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The getRegistration method is allowed to return null, which causes a NullPointerException when you try to invoke its getProvider method. A simple null check fixes that issue.
A friend of mine got such a NullPointerException when using your plug-in, even though I couldn't reproduce this situation myself. I rebuild your plug-in with this change, and that new build worked very well according to him.