diff --git a/indra/llwindow/llwindowmacosx.cpp b/indra/llwindow/llwindowmacosx.cpp
index 6dec131a3478146ae0823dedf43a559f99fa7239..3554f90be8c558f600888849b26c2f616cfa1321 100644
--- a/indra/llwindow/llwindowmacosx.cpp
+++ b/indra/llwindow/llwindowmacosx.cpp
@@ -382,7 +382,10 @@ void callWindowFocus()
 
 void callWindowUnfocus()
 {
-	gWindowImplementation->getCallbacks()->handleFocusLost(gWindowImplementation);
+	if ( gWindowImplementation && gWindowImplementation->getCallbacks() )
+	{
+		gWindowImplementation->getCallbacks()->handleFocusLost(gWindowImplementation);
+	}
 }
 
 void callWindowHide()