Typo fix

Author: cssedev

can/io/mf4.py

@@ -295,7 +295,7 @@ def __init__(self, mdf: MDF, group_index: int, start_timestamp: float, name: str
             self._channel_names = []
 
             for channel in channel_group.channels:
-                if channel.name.startwith(f"{self._name}."):
+                if str(channel.name).startswith(f"{self._name}."):
                     self._channel_names.append(channel.name)
 
             return