diff --git a/src/fetch/payouts.py b/src/fetch/payouts.py
index c81ed242..b1b39fbf 100644
--- a/src/fetch/payouts.py
+++ b/src/fetch/payouts.py
@@ -468,9 +468,13 @@ def construct_payouts(
     batch_rewards_df = batch_rewards_df.drop(
         ["partner_list", "partner_fee_eth"], axis=1
     )
+
+    assert batch_rewards_df["solver"].is_unique, "solver not unique in batch rewards"
+    assert quote_rewards_df["solver"].is_unique, "solver not unique in quote rewards"
     merged_df = pandas.merge(
         quote_rewards_df, batch_rewards_df, on="solver", how="outer"
     ).fillna(0)
+
     service_fee_df = pandas.DataFrame(dune.get_service_fee_status())
     service_fee_df["service_fee"] = [
         datetime.strptime(time_string, "%Y-%m-%d %H:%M:%S.%f %Z") <= dune.period.start
diff --git a/src/pg_client.py b/src/pg_client.py
index caaa4166..556cea39 100644
--- a/src/pg_client.py
+++ b/src/pg_client.py
@@ -8,8 +8,11 @@
 from sqlalchemy import create_engine
 from sqlalchemy.engine import Engine
 
+from src.logger import set_log
 from src.utils.query_file import open_query
 
+log = set_log(__name__)
+
 
 class MultiInstanceDBFetcher:
     """
@@ -57,7 +60,38 @@ def get_solver_rewards(self, start_block: str, end_block: str) -> DataFrame:
                 self.exec_query(query=batch_reward_query_barn, engine=engine)
             )
 
-        return pd.concat(results)
+        results_df = pd.concat(results)
+
+        # warn and merge in case of solvers in both environments
+        if not results_df["solver"].is_unique:
+            duplicated_entries = results_df[results_df["solver"].duplicated(keep=False)]
+            log.warning(
+                f"Solvers found in both environments:\n {duplicated_entries}.\n Merging results."
+            )
+
+            def merge_lists(series):
+                merged = []
+                for lst in series:
+                    if lst is not None:
+                        merged.extend(lst)
+                return merged if merged else None
+
+            results_df = (
+                results_df.groupby("solver")
+                .agg(
+                    {
+                        "primary_reward_eth": "sum",
+                        "protocol_fee_eth": "sum",
+                        "network_fee_eth": "sum",
+                        # there can be duplicate entries in partner_list now
+                        "partner_list": merge_lists,
+                        "partner_fee_eth": merge_lists,
+                    }
+                )
+                .reset_index()
+            )
+
+        return results_df
 
     def get_quote_rewards(self, start_block: str, end_block: str) -> DataFrame:
         """Returns aggregated solver quote rewards for block range"""
@@ -70,8 +104,19 @@ def get_quote_rewards(self, start_block: str, end_block: str) -> DataFrame:
             self.exec_query(query=quote_reward_query, engine=engine)
             for engine in self.connections
         ]
+        results_df = pd.concat(results)
+
+        # warn and merge in case of solvers in both environments
+        if not results_df["solver"].is_unique:
+            duplicated_entries = results_df[results_df["solver"].duplicated(keep=False)]
+            log.warning(
+                f"Solvers found in both environments:\n {duplicated_entries}.\n Merging results."
+            )
+            results_df = (
+                results_df.groupby("solver").agg({"num_quotes": "sum"}).reset_index()
+            )
 
-        return pd.concat(results)
+        return results_df
 
 
 def pg_hex2bytea(hex_address: str) -> str: