diff --git a/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py b/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
index 8a1a038..0574fb7 100644
--- a/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
+++ b/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
@@ -312,9 +312,9 @@ class TimepixFlyBackend:
             except Exception:
                 content = traceback.format_exc()
                 logger.error(f"Error in callback {cb} with error msg: {content}")
-                keys_in_msg_buffer = [
-                    f"{msg['type']} with keys {msg.keys()}" for msg in self.msg_buffer
-                ]
+                keys_in_msg_buffer = "".join(
+                    [f"{msg['type']} with keys {msg.keys()} \n" for msg in self.msg_buffer]
+                )
                 logger.info(f"Keys in message buffer: {keys_in_msg_buffer}")