diff --git a/src/add-ons/input_server/filters/screensaver/ScreenSaverFilter.cpp b/src/add-ons/input_server/filters/screensaver/ScreenSaverFilter.cpp
index 185e3bf6af..d72611375f 100644
--- a/src/add-ons/input_server/filters/screensaver/ScreenSaverFilter.cpp
+++ b/src/add-ons/input_server/filters/screensaver/ScreenSaverFilter.cpp
@@ -347,7 +347,8 @@ ScreenSaverFilter::Filter(BMessage *message, BList *outList)
 				fCurrentCorner = fBlankCorner;
 
 				// start screen blanker after one second of inactivity
-				if (fCornerRunner->SetInterval(kCornerDelay) != B_OK)
+				if (fCornerRunner != NULL
+					&& fCornerRunner->SetInterval(kCornerDelay) != B_OK)
 					_Invoke();
 				break;
 			}