Ajax errors when saving content

We've occasionally seen errors similar to the one below once a content item has been saved (through edit or create). It's not a show stopper but clients frequently ask about it.

The Url usually looks similar too:
/views/ajax?title=&type=poll&status=All&field_access_tid=All

An all white page contains:
[{"command":"settings","settings":{"basePath":"\/","pathPrefix":"","ajaxPageState":{"theme":"wwtheme","theme_token":"FjSzz3pClGVM6Q7oHC0h2F3YNMuKLfqStV4rydOgong"},"back_to_top":{"back_to_top_button_trigger":100,"back_to_top_prevent_on_mobile":true,"back_to_top_prevent_in_admin":true,"back_to_top_button_type":"image"},"overlay":{"paths":{"admin":"node\/*\/webform\nnode\/*\/webform\/*\nnode\/*\/webform-results\nnode\/*\/webform-results\/*\nnode\/*\/submission\/*\nuser\/*\/addressbook\/*\/create\nuser\/*\/addressbook\/*\/edit\/*\nuser\/*\/addressbook\/*\/delete\/*\ncommerce_backoffice\/order\/*\nfield-collection\/*\/*\/edit\nfield-collection\/*\/*\/delete\nfield-collection\/*\/add\/*\/*\nfile\/add\nfile\/add\/*\nfile\/*\/edit\nfile\/*\/delete\nmedia\/*\/edit\/*\nnode\/*\/edit\nnode\/*\/delete\nnode\/*\/revisions\nnode\/*\/revisions\/*\/revert\nnode\/*\/revisions\/*\/delete\nnode\/add\nnode\/add\/*\nnode\/*\/nodequeue\noverlay\/dismiss-message\nreferences-dialog\/search\/*\nuser\/*\/shortcuts\nadmin\nadmin\/*\nbatch\ntaxonomy\/term\/*\/edit\nuser\/*\/cancel\nuser\/*\/edit\nuser\/*\/edit\/*\ncommerce_backoffice\/variations\/*\ntaxonomy\/term\/*\/panelizer*\nnode\/*\/panelizer*\nuser\/*\/panelizer*","non_admin":"admin\/structure\/block\/demo\/*\nadmin\/reports\/status\/php"},"pathPrefixes":["es"],"ajaxCallback":"overlay-ajax"}},"merge":true}]