oschaaf commented on issue #1803: defer_javascript always fails on last script of page URL: https://github.com/apache/incubator-pagespeed-mod/issues/1803#issuecomment-431285562 Looking at the callstack when catching an exception, I observed stuff like: ``` .... new ShipperHQ.JQueryLoader.... .... ``` This then seems to be used to load in a bunch of jquery-related urls. I suspect that deferring javascript with mod_pagespeed is inducing race/ordering conditions (or possibly augmenting them). The defer_javascript filter is marked as high-risk, I think you are running into one of the reasons why it is marked as such.
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