diff --git a/core/thumb.cpp b/core/thumb.cpp
index 2fcaaaf..218dadf 100755
--- a/core/thumb.cpp
+++ b/core/thumb.cpp
@@ -80,7 +80,7 @@ bool end;
 			CreateThumbnail();
 
 	}
-	while( !end );
+	while( !end && !IsExitSignal() );
 }