diff --git a/nifi/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java b/nifi/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java
index 89850cc165..43e05dda1d 100644
--- a/nifi/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java
+++ b/nifi/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/scheduling/StandardProcessScheduler.java
@@ -297,7 +297,9 @@ public final class StandardProcessScheduler implements ProcessScheduler {
                         final Class<? extends ControllerService> serviceDefinition = descriptor.getControllerServiceDefinition();
                         if ( serviceDefinition != null ) {
                             final String serviceId = processContext.getProperty(descriptor).getValue();
-                            serviceIds.add(serviceId);
+                            if ( serviceId != null ) {
+                            	serviceIds.add(serviceId);
+                            }
                         }
                     }