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@@ -749,7 +749,7 @@ var Reveal = (function(){
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// If we were on a vertical stack, remember what vertical index
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// it was on so we can resume at the same position when returning
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- if( previousSlide && previousSlide.parentNode.classList.contains( 'stack' ) ) {
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+ if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
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setPreviousVerticalIndex( previousSlide.parentNode, indexv );
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}
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