throws variable_get warning

Running clean install of dxmpp.module throws this warning: Missing argument 2 for variable_get(), called in /Users/james/Documents/work/imbee/temp/svn/trunk/sites/all/modules/custom/dxmpp/dxmpp.module on line 243 and defined in /Users/james/Documents/work/imbee/temp/svn/trunk/includes/bootstrap.inc on line 526.