diff --git a/src/macaron/repo_finder/commit_finder.py b/src/macaron/repo_finder/commit_finder.py
index c2f0c7e04..be75c92b8 100644
--- a/src/macaron/repo_finder/commit_finder.py
+++ b/src/macaron/repo_finder/commit_finder.py
@@ -213,7 +213,7 @@ def extract_commit_from_version(git_obj: Git, version: str) -> str | None:
     if not commit:
         return None
 
-    return str(commit.hash)
+    return commit.hash if commit else None
 
 
 def find_commit_from_version_and_name(git_obj: Git, name: str, version: str) -> str | None: