diff --git a/bundles/org.openhab.binding.pjlinkdevice/src/main/java/org/openhab/binding/pjlinkdevice/internal/discovery/AbstractDiscoveryParticipant.java b/bundles/org.openhab.binding.pjlinkdevice/src/main/java/org/openhab/binding/pjlinkdevice/internal/discovery/AbstractDiscoveryParticipant.java
index 1e9effbdc..2d9f09e83 100644
--- a/bundles/org.openhab.binding.pjlinkdevice/src/main/java/org/openhab/binding/pjlinkdevice/internal/discovery/AbstractDiscoveryParticipant.java
+++ b/bundles/org.openhab.binding.pjlinkdevice/src/main/java/org/openhab/binding/pjlinkdevice/internal/discovery/AbstractDiscoveryParticipant.java
@@ -97,6 +97,7 @@ public abstract class AbstractDiscoveryParticipant extends AbstractDiscoveryServ
             Thread.currentThread().interrupt(); // Reset interrupt flag
         }
         executorService.shutdown();
+        this.executorService = null;
     }
 
     public static ThingUID createServiceUID(String ip, int tcpPort) {