From 65b5384b3ef46b481e0af2bcbc88f67af3fd9b70 Mon Sep 17 00:00:00 2001
From: tserg <8017125+tserg@users.noreply.github.com>
Date: Mon, 14 Aug 2023 14:00:42 +0800
Subject: [PATCH] check mutability attr exists

---
 vyper/semantics/analysis/annotation.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/vyper/semantics/analysis/annotation.py b/vyper/semantics/analysis/annotation.py
index f76e8dd2bc..2f59b89ca9 100644
--- a/vyper/semantics/analysis/annotation.py
+++ b/vyper/semantics/analysis/annotation.py
@@ -187,7 +187,8 @@ def _check_mutability(call_type):
             for arg, arg_type in zip(node.args, call_type.arg_types):
                 self.visit(arg, arg_type)
         else:
-            _check_mutability(call_type)
+            if hasattr(call_type, "mutability"):
+                _check_mutability(call_type)
 
             # builtin functions
             arg_types = call_type.infer_arg_types(node)