Blank page when inlining loadCSS and module disabled

First off all, thank you for this great module. I’m using the Advagg Modifier for loading CSS with JS via the library loadCSS. I use the option “Inline javascript loader library (if enabled this is recommended)”. Everything works fine, except when I disable the module in the UI or in settings.php $config[‘advagg.settings’][‘enabled’] = FALSE. Drupal is returning a blank page.

I dug a little bit deeper to find the source of the problem and found a bug in “\Drupal\advagg_mod\Asset\DeferCss” line 71. A variable $pattern is set with a path to the “loadCSS.js” file. But the path contains forward slashes and so the preg_replace_callback matches 0. Given $content is returning NULL. The solution I’ve found is to escape the forward slashes.