Dear Dapike,
We had the same issue on a website we were developing. The solution we found was to roll back the wordpress installation. We simply used the linked plugin in this comment, and rolled back our wordpress version to V4.9.8.
Hope all goes well for you
AnonDevs.
https://www.ads-software.com/plugins/wp-downgrade/
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This reply was modified 5 years, 9 months ago by anondevs.