diff --git a/api/services/credit_pool_service.py b/api/services/credit_pool_service.py
index 8ae409809a..bc2ca6ca1e 100644
--- a/api/services/credit_pool_service.py
+++ b/api/services/credit_pool_service.py
@@ -61,7 +61,12 @@ class CreditPoolService:
                     TenantCreditPool.quota_used + credits_required <= TenantCreditPool.quota_limit,
                 ]
                 stmt = update(TenantCreditPool).where(*where_conditions).values(**update_values)
-                session.execute(stmt)
+                result = session.execute(stmt)
                 session.commit()
+                if result.rowcount == 0:
+                    raise QuotaExceededError(
+                        f"Insufficient credits. Required: {credits_required}, Available: {pool.remaining_credits}"
+                    )
         except Exception:
+            logger.exception("Failed to deduct credits for tenant %s", tenant_id)
             raise QuotaExceededError("Failed to deduct credits")