From 6de3dee515fa58510c9c0c64ed75a209a79a9dcf Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Sat, 28 Sep 2019 09:38:07 +1000
Subject: Backport: Bug [#2129]. Fix crash with 'interface=none' comment.

Backport of changeset 7692:88e3b32fc9c0.
---
 lexers/LexMetapost.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lexers')

diff --git a/lexers/LexMetapost.cxx b/lexers/LexMetapost.cxx
index 315a1eab0..7f4e69e59 100644
--- a/lexers/LexMetapost.cxx
+++ b/lexers/LexMetapost.cxx
@@ -177,7 +177,8 @@ static void ColouriseMETAPOSTDoc(
 	}
 
 	WordList &keywords  = *keywordlists[0] ;
-	WordList &keywords2 = *keywordlists[extraInterface-1] ;
+	WordList kwEmpty;
+	WordList &keywords2 = (extraInterface > 0) ? *keywordlists[extraInterface - 1] : kwEmpty;
 
 	StyleContext sc(startPos, length, SCE_METAPOST_TEXT, styler) ;
 
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