From 65c8fb38a078b070f658e9595a93ecd60b18466a Mon Sep 17 00:00:00 2001
From: Daniel Post <daniel@danielpost.com>
Date: Sun, 9 Feb 2020 00:04:48 +0100
Subject: [PATCH] Add check for className (fixes #1)

---
 src/layout-settings.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/layout-settings.js b/src/layout-settings.js
index bfd0bf8..6a02fb9 100644
--- a/src/layout-settings.js
+++ b/src/layout-settings.js
@@ -109,8 +109,13 @@ const addProps = ( props, blockType, { columns, showColumnsOnMobile } ) => {
 		return props;
 	}
 
-	const className = classnames( `wp-block-list--${ columns }-columns`, {
+	if ( typeof props.className === 'undefined' || ! props.className ) {
+		return props;
+	}
+
+	const className = classnames( {
 		'wp-block-list--show-columns-on-mobile': showColumnsOnMobile,
+		[ `wp-block-list--${ columns }-columns` ]: Number( columns ) > 1,
 	} );
 
 	return assign( props, {