diff --git a/src/osx/idle.c b/src/osx/idle.c
index c24c30438..badad7fba 100644
--- a/src/osx/idle.c
+++ b/src/osx/idle.c
@@ -114,6 +114,7 @@ static PyObject * idle_getIdleSec(PyObject *self, PyObject *args)
     else
     {
         printf("Couldn't grab properties of system\n");
+        return NULL;
     }
 
     if (obj)