diff --git a/vendor-update/vendor-update.py b/vendor-update/vendor-update.py
index feb1519..6f792ef 100644
--- a/vendor-update/vendor-update.py
+++ b/vendor-update/vendor-update.py
@@ -192,6 +192,8 @@ def assign_pr_to_project(pr: PullRequest, project_id: str) -> bool:
             for version in vendor_versions
             if all(name not in version.get("version") for name in {"alpha", "beta"})
         ]
+        if len(vendor_versions) == 0:
+            continue
         vendor_versions.sort(key=functools.cmp_to_key(compareVersions), reverse=True)
         new_vendor = vendor_versions[0]
         new_version = new_vendor.get("version")