diff --git a/paramecio2/libraries/db/webmodel.py b/paramecio2/libraries/db/webmodel.py
index f7a9a35..7ce0748 100644
--- a/paramecio2/libraries/db/webmodel.py
+++ b/paramecio2/libraries/db/webmodel.py
@@ -928,7 +928,7 @@ class WebModel:
             try:
                 in_list[x]=str(int(in_list[x]))
             except:
-                in_list[x]=str(0)
+                in_list[x]='0'
         return '('+', '.join(in_list)+')'
         
     def check_in_list_str(self, field, in_list):