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@anastas10s Reverting to 3.3.0 seems to work on my end… I’ll have to look into 3.4.1.

@anastas10s The updated logic is_opcache_save_message_enabled() in WooCommerce_Square_Loader (line 406) in 3.4.0 doesn’t work the same way as it did before (though it’s more robust, for sure), and I think that’s what’s causing the issue (at least for me).

In my case, I don’t have either cache module loaded (Zend Optimizer+ or Zend OPcache), so both $zend_optimizer_plus and $zend_opcache in that function will be false, and so is_opcache_save_message_enabled() will also return false. Unfortunately, is_environment_compatible() (line 349) assumes that means it’s an invalid config, and errors out.

It’s not an invalid config–I don’t even have caching turned on to need to turn on save_comments. I feel like that logic needs another update to account for setups where opcode caching isn’t turned on and the bug it’s trying to fix doesn’t apply.