From 9754a1423ec21c922e692e96127ac4afb14a05c1 Mon Sep 17 00:00:00 2001
From: Charles Cooper <cooper.charles.m@gmail.com>
Date: Sat, 16 Dec 2023 08:56:31 -0500
Subject: [PATCH] fix: missing not None check

---
 boa/vyper/contract.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/boa/vyper/contract.py b/boa/vyper/contract.py
index b7b79284..bd2fc424 100644
--- a/boa/vyper/contract.py
+++ b/boa/vyper/contract.py
@@ -307,8 +307,8 @@ def _check(cond, msg=""):
         _check(
             err == frame.pretty_vm_reason
             or err == frame.error_detail
-            or err == frame.dev_reason.reason_str,
-            "does not match {args}",
+            or (frame.dev_reason and err == frame.dev_reason.reason_str),
+            f"does not match {args}",
         )
         return