diff --git a/src/repo2lark/utils.py b/src/repo2lark/utils.py
index b3e0e6f..ae88429 100644
--- a/src/repo2lark/utils.py
+++ b/src/repo2lark/utils.py
@@ -82,6 +82,8 @@ def truncate(text: str, length: int = 80) -> str:
     Returns:
         Truncated text.
     """
+    if text is None:
+        return ""
     if len(text) > length:
         return text[: length - 3] + "..."
     return text