diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index e9bf7f4303c..1eac0428970 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -2808,6 +2808,8 @@ GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode)
 		 * on this lockable object.
 		 */
 		LWLockRelease(partitionLock);
+		vxids[count].backendId = InvalidBackendId;
+		vxids[count].localTransactionId = InvalidLocalTransactionId;
 		return vxids;
 	}
 
@@ -2861,6 +2863,8 @@ GetLockConflicts(const LOCKTAG *locktag, LOCKMODE lockmode)
 	if (count > MaxBackends)	/* should never happen */
 		elog(PANIC, "too many conflicting locks found");
 
+	vxids[count].backendId = InvalidBackendId;
+	vxids[count].localTransactionId = InvalidLocalTransactionId;
 	return vxids;
 }