Long running process as System User cant Kill

We have a long running process. When we go into the console. Look under the Advanced button, Selecting Show active server actions. We see a process that has been running for over 6 hours. It is running under the user System with a type of CUSTOM. No other information is available. When we try to kill it we get an error message. The server encountered an error. An unhandled exception occurred! Java.lang.NullPointerException.   Any ideas of what this process may be? Any suggestions in how to kill this process?
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