param "state" missing, cross-site request forgery

Hi there,
Thanks for this plugin. I installed it on a different site and it worked fine but on my current project, when I try to use the FB login, I get the following error:

Facebook SDK returned an error: Cross-site request forgery validation failed. Required param “state” missing.

A web search yielded lots of technical solutions, just wondering if you’ve seen this error before..
Cheers
Wayne

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