Fix wrong type.

Change-Id: Ibc8e72960f5548245763520729a3f125e806a737
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapState.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapState.java
index 57758da..e70e0e6 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapState.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapState.java
@@ -325,7 +325,7 @@
             Commit<? extends Unlisten> commit) {
         try {
             Commit<? extends AtomixConsistentTreeMapCommands.Listen> listener =
-                    listeners.remove(commit.session());
+                    listeners.remove(commit.session().id());
             if (listener != null) {
                 listener.close();
             }