I get an error from the plugin

I get an error of the plugin, so sometimes my site is no longer accessible.
The error is:

Strict Standards: Redefining already defined constructor for class Login_Redirect in /customers/1/f/e/vanwelie.net/httpd.www/wp-content/plugins/login-redirect/login-redirect.php on line 45 Deprecated: Assigning the return value of new by reference is deprecated in /customers/1/f/e/vanwelie.net/httpd.www/wp-content/plugins/login-redirect/login-redirect.php on line 146

How can I fix it?