From e55d9454da30f7c44924809969741f8b7531e832 Mon Sep 17 00:00:00 2001
From: Cary R <cygcary@yahoo.com>
Date: Sun, 13 Jul 2025 19:37:27 -0700
Subject: [PATCH] Calling front() on an empty() list is undefined

---
 pform.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pform.cc b/pform.cc
index 71962a830..e1d5221be 100644
--- a/pform.cc
+++ b/pform.cc
@@ -790,8 +790,8 @@ bool pform_in_interface()
 
 static bool pform_at_module_level()
 {
-      return (lexical_scope == pform_cur_module.front())
-          || (lexical_scope == pform_cur_generate);
+      return (!pform_cur_module.empty() && (lexical_scope == pform_cur_module.front())) ||
+             (lexical_scope == pform_cur_generate);
 }
 
 PWire*pform_get_wire_in_scope(perm_string name)