diff --git a/pr_agent/tools/pr_reviewer.py b/pr_agent/tools/pr_reviewer.py
index 80782546..c9446029 100644
--- a/pr_agent/tools/pr_reviewer.py
+++ b/pr_agent/tools/pr_reviewer.py
@@ -54,7 +54,7 @@ class PRReviewer:
 
     def parse_args(self, args):
         is_incremental = False
-        if len(args) >= 1:
+        if args and len(args) >= 1:
             arg = args[0]
             if arg == "-i":
                 is_incremental = True