diff --git a/src/backend/replication/walreceiverfuncs.c b/src/backend/replication/walreceiverfuncs.c
index 496605f..0c45b66 100644
--- a/src/backend/replication/walreceiverfuncs.c
+++ b/src/backend/replication/walreceiverfuncs.c
@@ -328,6 +328,8 @@ GetReplicationApplyDelay(void)
 	long		secs;
 	int			usecs;
 
+	TimestampTz	chunckReplayStartTime;
+
 	SpinLockAcquire(&walrcv->mutex);
 	receivePtr = walrcv->receivedUpto;
 	SpinLockRelease(&walrcv->mutex);
@@ -337,7 +339,12 @@ GetReplicationApplyDelay(void)
 	if (receivePtr == replayPtr)
 		return 0;
 
-	TimestampDifference(GetCurrentChunkReplayStartTime(),
+	chunckReplayStartTime = GetCurrentChunkReplayStartTime();
+
+	if (chunckReplayStartTime == 0)
+		return 0;
+
+	TimestampDifference(chunckReplayStartTime,
 						GetCurrentTimestamp(),
 						&secs, &usecs);