diff --git a/plugins/generic/users.py b/plugins/generic/users.py
index 17b7330d1..52b1fa1c5 100644
--- a/plugins/generic/users.py
+++ b/plugins/generic/users.py
@@ -80,7 +80,7 @@ class Users:
             query = queries[Backend.getIdentifiedDbms()].is_dba.query
 
         query = agent.forgeCaseStatement(query)
-        kb.data.isDba = inject.checkBooleanExpression(query)
+        kb.data.isDba = inject.checkBooleanExpression(query) or False
 
         return kb.data.isDba