Fix bug where course stats request did not check existence of course correctly

api/src/api/routes/stats.py

@@ -329,7 +329,7 @@ def api_route_get_course_stats(course_id: int):
             Course.select({
                 AC_IS_MOD: True
             }, [])
-            .where(Lecture.id == course_id)
+            .where(Course.id == course_id)
         )
         if course is None:
             raise ApiClientException(ERROR_UNKNOWN_OBJECT)