diff --git a/src/playsim/a_dynlight.cpp b/src/playsim/a_dynlight.cpp
index 606db2221..b538a769f 100644
--- a/src/playsim/a_dynlight.cpp
+++ b/src/playsim/a_dynlight.cpp
@@ -342,7 +342,7 @@ void FDynamicLight::Tick()
 		
 		if (scale == 0.f) scale = 1.f;
 		
-		intensity = Sector->lightlevel * scale;
+		intensity = Sector? Sector->lightlevel * scale : 0;
 		intensity = clamp<float>(intensity, 0.f, 255.f);
 		
 		m_currentRadius = intensity;