From 9377f7b69bf9af111755a9fc727ec24930717d99 Mon Sep 17 00:00:00 2001
From: Bailey Pearson <bailey.pearson@mongodb.com>
Date: Tue, 13 Sep 2022 07:58:08 -0400
Subject: [PATCH] fix: guard against monitor check running while monitor check
 is in progress

---
 src/sdam/monitor.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/sdam/monitor.ts b/src/sdam/monitor.ts
index 47268a4a419..73abe01b93d 100644
--- a/src/sdam/monitor.ts
+++ b/src/sdam/monitor.ts
@@ -335,6 +335,10 @@ function checkServer(monitor: Monitor, callback: Callback<Document | null>) {
 
 function monitorServer(monitor: Monitor) {
   return (callback: Callback) => {
+    if (monitor.s.state === STATE_MONITORING) {
+      callback();
+      return;
+    }
     stateTransition(monitor, STATE_MONITORING);
     function done() {
       if (!isInCloseState(monitor)) {