diff --git a/web/reNgine/tasks.py b/web/reNgine/tasks.py
index 63f72839d..cb6b2580b 100644
--- a/web/reNgine/tasks.py
+++ b/web/reNgine/tasks.py
@@ -55,7 +55,7 @@ def initiate_scan(
         scan_type,
         engine_type,
         imported_subdomains=None,
-        out_of_scope_subdomains=None
+        out_of_scope_subdomains=[]
         ):
     '''
     scan_type = 0 -> immediate scan, need not create scan object