fix: ensure monitor has rtt pinger in when calculating rtt (#2757)

mongodb · Mar 16, 2021 · b94519b · b94519b
1 parent c976a01
commit b94519b
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/lib/core/sdam/monitor.js b/lib/core/sdam/monitor.js
@@ -222,9 +222,10 @@ function checkServer(monitor, callback) {
       }
 
       const isMaster = result.result;
-      const duration = isAwaitable
-        ? monitor[kRTTPinger].roundTripTime
-        : calculateDurationInMs(start);
+      const rttPinger = monitor[kRTTPinger];
+
+      const duration =
+        isAwaitable && rttPinger ? rttPinger.roundTripTime : calculateDurationInMs(start);
 
       monitor.emit(
         'serverHeartbeatSucceeded',