From 0caefa15939ffc7bce9b8dca356aec5d8398dbdd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Villemot?= <sebastien@dynare.org>
Date: Wed, 9 Feb 2022 14:32:25 +0100
Subject: [PATCH] Bytecode: exit gracefully when M_ does not exist

---
 mex/sources/bytecode/ErrorHandling.hh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mex/sources/bytecode/ErrorHandling.hh b/mex/sources/bytecode/ErrorHandling.hh
index b02bc19e1..ee5eb8de0 100644
--- a/mex/sources/bytecode/ErrorHandling.hh
+++ b/mex/sources/bytecode/ErrorHandling.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2007-2021 Dynare Team
+ * Copyright © 2007-2022 Dynare Team
  *
  * This file is part of Dynare.
  *
@@ -203,6 +203,8 @@ public:
   ErrorMsg()
   {
     mxArray *M_ = mexGetVariable("global", "M_");
+    if (!M_)
+      mexErrMsgTxt("Can't find global variable M_");
     if (mxGetFieldNumber(M_, "endo_names") == -1)
       {
         nb_endo = 0;