Plugin crashed, fatal error

I have the following errormessage, when the plugin is active.
It ran fine before, I was working on the articles and pictures and after logout i had a fatal error.

Notice: Undefined index: post_type in /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php on line 307

Notice: Undefined index: post_type in /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php on line 307

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php:307) in /www/htdocs/w00d28dd/satyrwww/wp-includes/functions.php on line 6712

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php:307) in /www/htdocs/w00d28dd/satyrwww/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php:307) in /www/htdocs/w00d28dd/satyrwww/wp-admin/admin-header.php on line 9

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php:307) in /www/htdocs/w00d28dd/satyrwww/wp-includes/option.php on line 1097

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d28dd/satyrwww/wp-content/plugins/wp-links-page/wp-links-page-free.php:307) in /www/htdocs/w00d28dd/satyrwww/wp-includes/option.php on line 1098

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