From b6c7454f52a69a5e982aa154a06a0ff0c98923c6 Mon Sep 17 00:00:00 2001
From: Atlantiscze <git@stepanekjakub.cz>
Date: Thu, 20 Nov 2014 14:45:12 +0100
Subject: [PATCH] Fixes possible runtime when sensor is destroyed while open in
 computer.

---
 code/modules/power/sensors/sensor_monitoring.dm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/code/modules/power/sensors/sensor_monitoring.dm b/code/modules/power/sensors/sensor_monitoring.dm
index f371042722..0325790ec3 100644
--- a/code/modules/power/sensors/sensor_monitoring.dm
+++ b/code/modules/power/sensors/sensor_monitoring.dm
@@ -77,13 +77,15 @@
 		if(!grid_sensors)
 			t += "Unable to connect to sensor!"
 		else
-			var/obj/machinery/power/sensor/OKS
+			var/obj/machinery/power/sensor/OKS = null
 			for(var/obj/machinery/power/sensor/S in grid_sensors)
 				if(S.name_tag == active_sensor)
 					OKS = S
-
-			t += "<B>[OKS.name_tag] - Sensor Reading</B><BR>"
-			t += OKS.ReturnReading()
+			if(OKS)
+				t += "<B>[OKS.name_tag] - Sensor Reading</B><BR>"
+				t += OKS.ReturnReading()
+			else
+				t += "Unable to connect to sensor!"
 
 
 	else