diff --git a/nifi-nar-bundles/nifi-py4j-bundle/nifi-py4j-bridge/src/main/java/org/apache/nifi/py4j/PythonProcess.java b/nifi-nar-bundles/nifi-py4j-bundle/nifi-py4j-bridge/src/main/java/org/apache/nifi/py4j/PythonProcess.java
index 3cfb2b30f4..2e4779bfab 100644
--- a/nifi-nar-bundles/nifi-py4j-bundle/nifi-py4j-bridge/src/main/java/org/apache/nifi/py4j/PythonProcess.java
+++ b/nifi-nar-bundles/nifi-py4j-bundle/nifi-py4j-bridge/src/main/java/org/apache/nifi/py4j/PythonProcess.java
@@ -361,7 +361,9 @@ public class PythonProcess {
     }
 
     private synchronized void killProcess() {
-        StandardLogLevelChangeHandler.getHandler().removeListener(logListenerId);
+        if (logListenerId != null) {
+            StandardLogLevelChangeHandler.getHandler().removeListener(logListenerId);
+        }
 
         if (server != null) {
             try {