SLING-9717 - Avoid DistributionSubscriber optional fields
diff --git a/src/main/java/org/apache/sling/distribution/journal/impl/subscriber/DistributionSubscriber.java b/src/main/java/org/apache/sling/distribution/journal/impl/subscriber/DistributionSubscriber.java
index c5f704d..ada39a4 100644
--- a/src/main/java/org/apache/sling/distribution/journal/impl/subscriber/DistributionSubscriber.java
+++ b/src/main/java/org/apache/sling/distribution/journal/impl/subscriber/DistributionSubscriber.java
@@ -114,7 +114,7 @@
     @Reference
     private SubscriberReadyStore subscriberReadyStore;
     
-    private IdleCheck idleCheck;
+    private volatile IdleCheck idleCheck;
     
     private Closeable packagePoller;