From a2e9e525d5d1f02f8b712be379f8cc4bc1dacb25 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Mon, 27 May 2019 07:30:08 +0200
Subject: [PATCH] avoid exception when highlighting empty code blocks

---
 plugin/highlight/highlight.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/plugin/highlight/highlight.js b/plugin/highlight/highlight.js
index e50676f6..776f09ca 100644
--- a/plugin/highlight/highlight.js
+++ b/plugin/highlight/highlight.js
@@ -117,6 +117,9 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
 
 			hljs.highlightBlock( block );
 
+			// Don't generate line numbers for empty code blocks
+			if( block.innerHTML.trim().length === 0 ) return;
+
 			if( block.hasAttribute( 'data-line-numbers' ) ) {
 				hljs.lineNumbersBlock( block, { singleLine: true } );