Don't reuse variable for different types

producer/api/python/asapo_producer.pyx.in

@@ -148,8 +148,8 @@ cdef class PyProducer:
         cdef MessageHeader message_header = self.create_message_header(id,exposed_path,user_meta,dataset,ingest_mode,auto_id)
         try:
             message_header.data_size = data_nbytes(data)
-        except Exception as err:
-            raise AsapoProducerError("wrong data type: " + str(type(data))) from err
+        except Exception as ex:
+            raise AsapoProducerError("wrong data type: " + str(type(data))) from ex
 
         err = self.c_producer.get().Send__(message_header, data_pointer(data),ingest_mode,_bytes(stream),
             unwrap_callback_with_memory(<RequestCallbackCythonMemory>self.c_callback_data,