[Plugin: WP-dTree] stripos function error followed by crash of site

i’ve been using the plugin for a few weeks with no problems. all of a sudden, it is now generating the following php errors that crashed the site.

PHP Warning: stripos() [function.stripos]: Offset not contained in string in … wp-dtree-30/wp-dtree-build.php on line 92,

that error is followed by,

The timeout specified has expired: ap_content_length_filter: apr_bucket_read() failed

p.s. i have not added any other code so i don’t think there are other plugins, etc. causing the problem.

http://wordpress.org/extend/plugins/wp-dtree-30/