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Error loading block: The response is not a valid JSON response.

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  • December 29, 2025 at 9:52 PM #49559
    Key_WebdesignKey_Webdesign
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    With multiple websites I'm getting the error notice "Error loading block: The response is not a valid JSON response.", when editing a page where I use MB Blocks custom blocks.
    This behaviour seems to be unstable, since it's not consistent what blocks give the error. Sometimes I get no errors, sometimes I get 12 errors out of the 24 custom blocks in the page.

    What could be causing this?

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