diff --git a/script/release/release/repository.py b/script/release/release/repository.py
index 9a5d432c0..bb8f4fbeb 100644
--- a/script/release/release/repository.py
+++ b/script/release/release/repository.py
@@ -219,6 +219,8 @@ def get_contributors(pr_data):
     commits = pr_data.get_commits()
     authors = {}
     for commit in commits:
+        if not commit.author:
+            continue
         author = commit.author.login
         authors[author] = authors.get(author, 0) + 1
     return [x[0] for x in sorted(list(authors.items()), key=lambda x: x[1])]