EffortPersonRole caused error / #4699

Error 20070420130209 NOTICE: listslist_effortsperson.inc.php : 129 Undefined offset:  -1
Error 20070420130209 listslist_effortsperson.inc.php :  89 -> ListBlock::render_trow(*Effort)
Error 20070420130209 listslist_effortsperson.inc.php :  70 -> ListBlock_effortsPerson::renderListHtml([1])
Error 20070420130209 listslist_effortsperson.inc.php :  57 -> ListBlock_effortsPerson::render_list([1])
Error 20070420130209    pagesproject_more.inc.php :1632 -> ListBlock_effortsPerson::print_automatic()
Error 20070420130209 stdclass_pagehandler.inc.php : 719 -> ProjViewEfforts()
Error 20070420130209 stdclass_pagehandler.inc.php : 620 -> PageHandler::show("projViewEfforts", [2])
Error 20070420130209          pageseffort.inc.php : 746 -> PageHandler::showFromPage()
Error 20070420130209 stdclass_pagehandler.inc.php : 719 -> effortEditSubmit()
Error 20070420130209                     index.php : 206 -> PageHandler::show("effortEditSubmit")
Error 20070420130209 
Error 20070420130209      Variables in render_trow():
Error 20070420130209                           obj = OBJECT
Error 20070420130209                         style = NULL
Error 20070420130209          g_user_profile_names = Array
Error 20070420130209                       project = OBJECT
Error 20070420130209                            pp = Array
Error 20070420130209    v0.07972, projViewEfforts, from 127.0.0.1,  uri:/streber/index.php

from list_effortperson.inc.php line 127

		if($project = Project::getVisibleById($obj->project)){
			if($pp = $project->getProjectPersons(array('person_id'=>$obj->person))){
				$role = $g_user_profile_names[intval($pp[0]->role)];
			}
			else{
				$role = '';
			}
			
		}