From dba67afa3d383e1a7447d8484968e4e6b0252f1e Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Sat, 28 Sep 2019 09:38:07 +1000
Subject: Bug [#2129]. Fix crash with 'interface=none' comment.

---
 doc/ScintillaHistory.html | 4 ++++
 lexers/LexMetapost.cxx    | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 9adbc9379..72ed06c0a 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -568,6 +568,10 @@
 	SciTE enables use of SCI_ commands in user.context.menu.
 	</li>
  	<li>
+	Metapost lexer fixes crash with 'interface=none' comment.
+	<a href="https://sourceforge.net/p/scintilla/bugs/2129/">Bug #2129</a>.
+	</li>
+ 	<li>
 	Perl lexer supports indented here-docs.
 	<a href="https://sourceforge.net/p/scintilla/bugs/2121/">Bug #2121</a>.
 	</li>
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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