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mavutil: fix type error in cache #1217

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Merged
tridge merged 1 commit into from
Jun 21, 2026
Merged

mavutil: fix type error in cache #1217

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5 changes: 4 additions & 1 deletion mavutil.py
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,10 @@ def add_message(messages, mtype, msg):
messages[mtype] = msg
return
instance_value = getattr(msg, msg._instance_field)
if not mtype in messages:
if not mtype in messages or messages[mtype]._instances is None:
# first instance-valued message for this type, or a previous message
# of this type was stored without an instance value (._instances is
# None), so the per-instance dict was never created
messages[mtype] = copy.copy(msg)
messages[mtype]._instances = {}
messages[mtype]._instances[instance_value] = msg
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