skoczian,

please test with this patch :

diff --git a/firebirdsql/fbcore.py b/firebirdsql/fbcore.py
index 3d301fc..128295f 100755
--- a/firebirdsql/fbcore.py
+++ b/firebirdsql/fbcore.py
@@ -406,9 +406,8 @@ class cursor:
for param in params: # Convert str/bytes parameter to
blob id
if type(param) == str:
param = self.connection.str_to_bytes(param)
- else:
- cooked_params.append(param)
- continue
+ cooked_params.append(param)
+ continue
self.connection._op_create_blob2()
(blob_handle, blob_id, buf2) = self.connection._op_response()
seg_size = self.connection.buffer_length