Add a precautionary check for the query tool connection cursor to fix the error 'NoneType' object has no attribute '_query'. #7660

web/pgadmin/tools/sqleditor/__init__.py

@@ -988,8 +988,8 @@ def poll(trans_id):
             query_len_data = {
                 'transaction_status': transaction_status,
                 'explain_query_length':
-                    get_explain_query_length(
-                        conn._Connection__async_cursor._query)
+                get_explain_query_length(conn._Connection__async_cursor._query)
+                if conn._Connection__async_cursor else 0
             }
             return internal_server_error(result, query_len_data)
         elif status == ASYNC_OK: