From 9f404f7b9708a5e962c2c3e8597f462f5f7344f5 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Sat, 26 Mar 2022 12:47:26 -0400
Subject: [PATCH] Add test for event before calling event->Duration.

---
 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 eb4eb3395..704df6639 100644
--- a/src/zm_monitor.cpp
+++ b/src/zm_monitor.cpp
@@ -2028,7 +2028,7 @@ bool Monitor::Analyse() {
               Info("%s: %03d - Gone into alert state", name.c_str(), analysis_image_count);
               shared_data->state = state = ALERT;
             } else if (state == ALERT) {
-              if (
+              if ( event &&
                   ((analysis_image_count - last_alarm_count) > post_event_count)
                   &&
                   (event->Duration() >= min_section_length)) {