diff --git a/Unreal/Plugins/AirSim/Source/SimMode/SimModeBase.cpp b/Unreal/Plugins/AirSim/Source/SimMode/SimModeBase.cpp
index ae53d7272d..454322cc40 100644
--- a/Unreal/Plugins/AirSim/Source/SimMode/SimModeBase.cpp
+++ b/Unreal/Plugins/AirSim/Source/SimMode/SimModeBase.cpp
@@ -160,7 +160,8 @@ void ASimModeBase::initializeTimeOfDay()
         UObjectProperty* sun_prop = Cast<UObjectProperty>(p);
         UObject* sun_obj = sun_prop->GetObjectPropertyValue_InContainer(sky_sphere_);
         sun_ = Cast<ADirectionalLight>(sun_obj);
-        default_sun_rotation_ = sun_->GetActorRotation();
+        if (sun_)
+            default_sun_rotation_ = sun_->GetActorRotation(); 
     }
 }