Steps to reproduce the issue

Update from Joomla 3.4.8 to Joomla 3.5.1

Expected result

Fixing the database

Actual result

When Pressing Fix ....An Internal Error 500 is shown

System information (as much as possible)

System Information
Setting Value

PHP Built On Linux ip-208-109-119-162.ip.secureserver.net 2.6.32-573.1.1.el6.centos.plus.x86_64 #1 SMP Sun Jul 26 00:52:05 UTC 2015 x86_64
Database Version 5.5.44
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.4.21
Web Server Apache
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 3.5.1 Stable [ Unicorn ] 05-April-2016 22:45 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36

Additional comments

My website is still working properly.

But please check the following thread.

http://forum.joomla.org/viewtopic.php?f=710&t=919659

Thank you for your help.