diff --git a/pr_agent/tools/pr_description.py b/pr_agent/tools/pr_description.py
index 6c021c3a..2e6e3a6a 100644
--- a/pr_agent/tools/pr_description.py
+++ b/pr_agent/tools/pr_description.py
@@ -507,7 +507,7 @@ class PRDescription:
         ai_type = self.data.get('type')
         if ai_type and not re.search(r'<!--\s*pr_agent:type\s*-->', body):
             if isinstance(ai_type, list):
-                pr_type = ', '.join(ai_type)
+                pr_type = ', '.join(str(t) for t in ai_type)
             else:
                 pr_type = ai_type
             pr_type = f"{ai_header}{pr_type}"