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Getting a Fatal Error message when trying to open Theme Options

sybezsybez
in Theme Options
Hi,

One of my sites has started showing an error when I try and open the Theme Options tab. the error says;

Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

If I deactivate Yoast SEO then the problem goes away, but I don't want to do that. Thing is I have run Yoast on many different sites and had no isues, its a great plugin. 

Only thing I can think of that has changed recently is upgrade to WP 4.9.1 and Updated theme to 20.7.5. It was all working fine before this as I've only just finished building the site.

I don't have any caching plugins installed anymore as I thought it was linked to Autoptimise, but I removed this and still have the issue.

Can anybody shed any light on whats happening? The error message is very vauge in telling you whats wrong and a search Google has returned few results.

Thanks

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