diff --git a/code/datums/alarm.dm b/code/datums/alarm.dm
index b266362f3ca..e25f96b95a5 100644
--- a/code/datums/alarm.dm
+++ b/code/datums/alarm.dm
@@ -201,4 +201,5 @@
 		for(var/area_name as anything in alarms_of_type)
 			var/list/alarm_packet = alarms_of_type[area_name]
 			var/list/cameras = alarm_packet[2]
-			cameras -= source // REF FOUND AND CLEARED BOYSSSS
+			if(cameras)
+				cameras -= source // REF FOUND AND CLEARED BOYSSSS