An AJAX HTTP error occurred in panel content editor

Hello there,
When clicking the small cog to add content to a panel layout the following error appears in a modal window

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /panels/ajax/editor/select-content/panel_context%3Apage-help%3Apage_help_panel_context/middle
StatusText: OK
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Does anyone have any advice?
Cheers