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Fix error when passing a rename field that does not exist in the log record #172

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5 changes: 3 additions & 2 deletions src/pythonjsonlogger/jsonlogger.py
Original file line number Diff line number Diff line change
Expand Up @@ -229,8 +229,9 @@ def add_fields(

def _perform_rename_log_fields(self, log_record):
for old_field_name, new_field_name in self.rename_fields.items():
log_record[new_field_name] = log_record[old_field_name]
del log_record[old_field_name]
if old_field_name in log_record:
log_record[new_field_name] = log_record[old_field_name]
del log_record[old_field_name]

def process_log_record(self, log_record):
"""
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