From e8ea7b03da4afb57027bf95618eab0f591be9b65 Mon Sep 17 00:00:00 2001
From: Voltrex <Ryuga.rago21@gmail.com>
Date: Sun, 13 Sep 2026 16:56:16 -0400
Subject: [PATCH] Name tolerated missing developer fields

---
 fitparse/base.py |  2 ++
 tests/test.py    | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/fitparse/base.py b/fitparse/base.py
index b0ebf87..9fdf044 100644
--- a/fitparse/base.py
+++ b/fitparse/base.py
@@ -49,6 +49,8 @@ def _append_dev_field_description(self, dev_data_index, field_def_num, type=BASE
             )
             self._append_dev_data_id(dev_data_index)
 
+        if name is None:
+            name = "unnamed_dev_field_%s" % field_def_num
         self.dev_types[dev_data_index]["fields"][field_def_num] = DevField(
             dev_data_index=dev_data_index,
             def_num=field_def_num,
diff --git a/tests/test.py b/tests/test.py
index e4851d5..b4fc6f7 100755
--- a/tests/test.py
+++ b/tests/test.py
@@ -2,6 +2,7 @@
 
 import csv
 import datetime
+import io
 import os
 from struct import pack
 import warnings
@@ -74,6 +75,17 @@ def testfile(filename):
 
 
 class FitFileTestCase(unittest.TestCase):
+    def test_tolerant_missing_developer_field_can_be_iterated(self):
+        definition = b'\x60\x00\x00' + pack('<HB', 0, 1) + bytes([0, 1, 0, 1, 0, 1, 0])
+        data = bytes([0, 4, 7])
+        header = pack('<2BHI4s', 14, 16, 152, len(definition + data), b'.FIT') + b'\x00\x00'
+
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore')
+            message = FitFile(io.BytesIO(header + definition + data), check_crc=False,
+                              check_developer_data=False).messages[0]
+        self.assertEqual(2, len(list(message)))
+
 
     def test_basic_file_with_one_record(self, endian='<'):
         f = FitFile(generate_fitfile(endian=endian))