From b2436a8ee8d8cf21883588a110734fece191cffb Mon Sep 17 00:00:00 2001
From: joker2770 <1214220480@qq.com>
Date: Sat, 29 Oct 2022 20:42:25 +0800
Subject: [PATCH] fix: Array \'keywordlists[0-1]\' accessed at index -1, which
 is out of bounds. :bug:

---
 qscint/scintilla/lexers/LexMetapost.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qscint/scintilla/lexers/LexMetapost.cpp b/qscint/scintilla/lexers/LexMetapost.cpp
index 315a1ea..5d067fc 100755
--- a/qscint/scintilla/lexers/LexMetapost.cpp
+++ b/qscint/scintilla/lexers/LexMetapost.cpp
@@ -175,6 +175,9 @@ static void ColouriseMETAPOSTDoc(
 	if (currentInterface != 0) {
 		extraInterface = currentInterface ;
 	}
+	else {
+		extraInterface = 1;
+	}
 
 	WordList &keywords  = *keywordlists[0] ;
 	WordList &keywords2 = *keywordlists[extraInterface-1] ;