500 Internal Server Error with no log entries (Apache Users)

500 Internal Server Error with no log entries

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To: users@xxxxxxxxxxxxxxxx

Subject: 500 Internal Server Error with no log entries

From: Mohammad Aghanabi <m.websoft@xxxxxxxxx>

Date: Wed, 23 Jan 2019 12:21:26 +0330

Reply-to: users@xxxxxxxxxxxxxxxx

I'm running Apache v2.4.27 X64 for serving PHP files and it was running fine until today that I'm seeing `500 Internal Server Error`.

Surprisingly nothing noticeable is logged neither in PHP error log file nor Apache's. I attempted to set `LogLevel warn trace8` and found this:

[Wed Jan 23 12:06:58.344368 2019] [fcgid:warn] [pid 13700:tid 1180] (OS 109)The pipe has been ended. : [client 127.0.0.1:54040] mod_fcgid: get overlap result error

[Wed Jan 23 12:06:58.344368 2019] [core:error] [pid 13700:tid 1180] [client 127.0.0.1:54040] End of script output before headers: index.php

But I can't realize where I should look for the problem.

What can I do to debug this?

Thanks