diff --git a/packages/valory/skills/decision_maker_abci/behaviours/decision_receive.py b/packages/valory/skills/decision_maker_abci/behaviours/decision_receive.py
index 7de3778d..6933c3d7 100644
--- a/packages/valory/skills/decision_maker_abci/behaviours/decision_receive.py
+++ b/packages/valory/skills/decision_maker_abci/behaviours/decision_receive.py
@@ -108,7 +108,7 @@ def _next_dataset_row(self) -> Optional[Dict[str, str]]:
         # we have now one reader pointer per market
         available_rows_for_market = self.shared_state.bet_id_row_manager[sampled_bet_id]
         if available_rows_for_market:
-            next_mock_data_row = self.shared_state.bet_id_row_manager[sampled_bet_id][0]
+            next_mock_data_row = available_rows_for_market[0]
         else:
             # no more bets available for this market
             msg = f"No more mock responses for the market with id: {sampled_bet_id}"