error message shows when saving node

•Notice: Use of undefined constant full_html - assumed 'full_html' in __lambda_func() (line 1 of /home/jixutuan/www/sites/all/modules/geshifilter/geshifilter.pages.inc(127) : runtime-created function).
•Notice: Use of undefined constant full_html - assumed 'full_html' in __lambda_func() (line 1 of /home/jixutuan/www/sites/all/modules/geshifilter/geshifilter.pages.inc(232) : runtime-created function).
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I tried to change line 127 of geshifilter.pages.inc from

 $text = preg_replace_callback($pattern, create_function('$match', "return _geshifilter_prepare_callback(\$match, $format);"), $text);

to

 $text = preg_replace_callback($pattern, create_function('$match', "return _geshifilter_prepare_callback(\$match, '$format');"), $text);

, that is, to enclose $format in quotes. The first error disappears.

Line 132, 137 and 232 may need such change too.