diff --git a/platypush/plugins/db/__init__.py b/platypush/plugins/db/__init__.py
index 70708bd8f..0b84900f9 100644
--- a/platypush/plugins/db/__init__.py
+++ b/platypush/plugins/db/__init__.py
@@ -125,7 +125,7 @@ class DbPlugin(Plugin):
         if not db_ok and last_error:
             raise last_error
 
-        assert table_, f'No such table: {table}'
+        assert table_ is not None, f'No such table: {table}'
         return table_, engine
 
     @action