Invalid User ID: 0 on Checkout page

  • Please help me with the following error on our website.

    All of a sudden we’re facing this, “INVALID USER ID: 0” on the checkout page for all payment gateways.

    Guest checkout is working fine.

    I have been in touch with Hosting support and they couldn’t fix it either.

    At first, we thought it was a cache issue but we are not sure.

    WPMU DEV & Cloudways support tried everything but couldn’t fix it.

    The page I need help with: [log in to see the link]

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