diff --git a/pycardano/backend/blockfrost.py b/pycardano/backend/blockfrost.py
index 3d5d1afe..f5a906ea 100644
--- a/pycardano/backend/blockfrost.py
+++ b/pycardano/backend/blockfrost.py
@@ -310,8 +310,13 @@ def evaluate_tx_cbor(self, cbor: Union[bytes, str]) -> Dict[str, ExecutionUnits]
             cbor = cbor.hex()
         with tempfile.NamedTemporaryFile(delete=False, mode="w") as f:
             f.write(cbor)
-        result = self.api.transaction_evaluate(f.name).result
+
+        result = self.api.transaction_evaluate(f.name)
         os.remove(f.name)
+        if not hasattr(result, "result"):
+            raise TransactionFailedException(result)
+        else:
+            result = result.result
         return_val = {}
         if not hasattr(result, "EvaluationResult"):
             raise TransactionFailedException(result)