Failed to execute 'removeChild' on 'Node'

[Stephen Marek]

I just started using mod_pagespeed for my Centos Apache server, and I'm getting this error logged in Chrome for all of ONE site's pages. Another site I host with the same server is fine, so clearly it is a conflict with the one site's html/css/js.

Uncaught DOMException: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.

    at I (/pagespeed_static/js_defer.I4cHjq6EEP.js:16:517)

    at G (/pagespeed_static/js_defer.I4cHjq6EEP.js:14:486)

    at HTMLScriptElement.b (/pagespeed_static/js_defer.I4cHjq6EEP.js:22:304)

Without diving into my site's code, does anyone have any idea what might be triggering this error? Or how to get a more detailed error message? I don't know what the node or child is, because the js_defer code has been minified and is impossible to follow. Any thoughts on how I can get more info on what it's trying to remove?

If I am using mod_pagespeed, should I remove all defer from script tags?

These are the filters I have enabled:

ModPagespeedEnableFilters prioritize_critical_css

ModPagespeedEnableFilters defer_javascript

ModPagespeedEnableFilters sprite_images

ModPagespeedEnableFilters rewrite_images

ModPagespeedEnableFilters recompress_png

ModPagespeedEnableFilters convert_jpeg_to_webp

ModPagespeedEnableFilters collapse_whitespace,remove_comments

ModPagespeedEnableFilters combine_css,combine_javascript

Thanks!

[Joshua Marantz]

This is definitely defer_javascript -- I can tell from the stack-trace you pasted.  If you remove that from the config, you should be fine.

Note that defer_javascript is a known risky filter that can break sites depending on how the site JS is structured.

You might want to try enabling rewrite_images, unless that does some specific transformations you don't want.

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[Stephen Marek]

Thanks! Yea I figured that's what it is and I turned it off, error is gone. I had read the info on the filter at https://www.modpagespeed.com/doc/filter-js-defer but it really didn't offer much help.

And I am using rewrite images. That one took some extra effort. Docs said if my virtual host is *:80, I'd be fine. Not true. I had to add the ModPagespeedDomain directive for each virtual host.