Index: geshifilter.pages.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/geshifilter/geshifilter.pages.inc,v
retrieving revision 1.3.2.7
diff -u -F^f -r1.3.2.7 geshifilter.pages.inc
--- geshifilter.pages.inc	1 May 2008 19:41:08 -0000	1.3.2.7
+++ geshifilter.pages.inc	24 Dec 2008 00:29:04 -0000
@@ -242,13 +242,13 @@ function _geshifilter_replace_callback($
 
   // Get additional settings from the tag attributes.
   $settings = _geshifilter_parse_attributes($tag_attributes, $format);
-  if ($settings['language']) {
+  if (isset($settings['language'])) {
     $lang = $settings['language'];
   }
-  if ($settings['line_numbering']) {
+  if (isset($settings['line_numbering'])) {
     $line_numbering = $settings['line_numbering'];
   }
-  if ($settings['linenumbers_start']) {
+  if (isset($settings['linenumbers_start'])) {
     $linenumbers_start = $settings['linenumbers_start'];
   }