Program terminated with signal 11, Segmentation fault.

I setting multiple PHP in Plesk, and one of my site wich use php 5.6 show the following error (debugged with gdb):
(gdb) core-file /tmp/core-php-cgi-11-10005-503-12050-1458921789
[New Thread 12050]
Core was generated by `/opt/plesk/php/5.6/bin/php-cgi -c /var/www/vhosts/system/dotxsoft.it/etc/php.in'.
Program terminated with signal 11, Segmentation fault.
#0 0x0000000000620296 in ?? ()
(gdb)

I see that the ini file isn't correct because is 'php.in' instead of 'php.ini'

Where can I set the...

Program terminated with signal 11, Segmentation fault.