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-rwxr-xr-xscripts-dev/definitions.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts-dev/definitions.py b/scripts-dev/definitions.py
index f5d4cc37fd..8340c72618 100755
--- a/scripts-dev/definitions.py
+++ b/scripts-dev/definitions.py
@@ -152,7 +152,7 @@ if __name__ == '__main__':
     while referrer_depth:
         referrer_depth -= 1
         for entry in result.values():
-            for used_by in entry["used"]:
+            for used_by in entry.get("used", ()):
                 referrers.add(used_by)
         for name, definition in names.items():
             if not name in referrers: