Missing closing DIV tag when adding custom CSS class could break layout

I have encountered a problem which could break the pages layout with a missing </div> tag which should be closing the

<div class="ShariffSC (...)

when adding a custom CSS class in the Shariff options.

I think it is down to the fact that for the opening tag it is checking for

array_key_exists( 'style', $atts ) || array_key_exists( 'cssclass', $atts )

but for the closing tag it is only checking

array_key_exists( 'style', $atts )

so if you have added a custom class but no custom styles, the div is not closed.

Possible solution (?)
I don’t know if I’m correct on this one, but changing

// if we had a style attribute close that too
if ( array_key_exists( 'style', $atts ) ) $output .= '</div>';

in line 910/911 to

// if we had a style attribute close that too
if ( array_key_exists( 'style', $atts ) || array_key_exists( 'cssclass', $atts ) ) $output .= '</div>';

solved the problem for me.