sentry throw error on laravel 5.1

I have use Laravel 5.1 with "jenssegers/raven": "^1.4"

When I run composer self-update on server then found error page isn’t working

Error log is:

PHP message: PHP Fatal error:  Uncaught exception 'ErrorException' with message 'preg_match() expects parameter 2 to be string, object given' in /var/www/html/http://ift.tt/1TJ7m48

Kindly help me, how to resolve this issue. I appreciate all response.

via Chebli Mohamed