php return 500 error but no error log

Scan your source files to find @.

From php documentation site

Currently the “@” error-control operator prefix will even disable
error reporting for critical errors that will terminate script
execution. Among other things, this means that if you use “@” to
suppress errors from a certain function and either it isn’t available
or has been mistyped, the script will die right there with no
indication as to why.

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