From eda96d24e093509f665b40b0f02df4e14cf52237 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Mon, 31 May 2021 16:02:42 -0400
Subject: [PATCH] fix crash when in alert state with no event

---
 src/zm_monitor.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/zm_monitor.cpp b/src/zm_monitor.cpp
index 795cd3e94..fb728ef3d 100644
--- a/src/zm_monitor.cpp
+++ b/src/zm_monitor.cpp
@@ -2231,7 +2231,7 @@ bool Monitor::Analyse() {
           }
         } else if ( state == ALERT ) {
           // Alert means this frame has no motion, but we were alarmed and are still recording.
-          if ( noteSetMap.size() > 0 )
+          if ((noteSetMap.size() > 0) and event)
             event->updateNotes(noteSetMap);
         } else if ( state == TAPE ) {
           // bulk frame code moved to event.