From 304b0292be05d387947481eee7060f67ab808b5b Mon Sep 17 00:00:00 2001 From: Hakim El Hattab Date: Mon, 4 Jul 2016 14:46:46 +0200 Subject: [PATCH] null computed style to avoid npe --- js/reveal.js | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/js/reveal.js b/js/reveal.js index 473a616b..b975ff43 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -855,15 +855,15 @@ // If this slide has a background color, add a class that // signals if it is light or dark. If the slide has no background // color, no class will be set - var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor; - if( computedBackgroundColor ) { - var rgb = colorToRgb( computedBackgroundColor ); + var computedBackgroundStyle = window.getComputedStyle( element ); + if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) { + var rgb = colorToRgb( computedBackgroundStyle.backgroundColor ); // Ignore fully transparent backgrounds. Some browsers return // rgba(0,0,0,0) when reading the computed background color of // an element with no background if( rgb && rgb.a !== 0 ) { - if( colorBrightness( computedBackgroundColor ) < 128 ) { + if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) { slide.classList.add( 'has-dark-background' ); } else {