[Error] 
Using $this when not in object context (0)
/home/bitrix/voench.ru/bitrix/modules/main/classes/mysql/database_mysqli.php:71
#0: CDatabase::ForSql(string)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/clearnaccess.php:1013
#1: CLearnAccess::EscapeAndAddLateralQuotes(string)
	
#2: array_map(array, array)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/clearnaccess.php:1003
#3: CLearnAccess::Array2CommaSeparatedListForSQL(array)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/clearnaccess.php:829
#4: CLearnAccess->GetBitmaskOperationsForAllLessons(array)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/clearnaccess.php:401
#5: CLearnAccess->IsBaseAccess(integer)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/clearnparsepermissionsfromfilter.php:39
#6: CLearnParsePermissionsFromFilter->__construct(array)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/mysql/certification.php:17
#7: CCertification::GetList(array, array)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/student.php:140
#8: CStudent::Delete(integer)
	/home/bitrix/voench.ru/bitrix/modules/learning/classes/general/course.php:587
#9: CCourse::OnUserDelete(integer)
	/home/bitrix/voench.ru/bitrix/modules/main/classes/general/module.php:490
#10: ExecuteModuleEventEx(array, array)
	/home/bitrix/voench.ru/bitrix/modules/main/classes/general/user.php:2367
#11: CAllUser::Delete(integer)
	/home/bitrix/voench.ru/bitrix/modules/main/classes/general/user.php:2816
#12: CAllUser::CleanUpAgent()
	/home/bitrix/voench.ru/bitrix/modules/main/classes/mysql/agent.php(161) : eval()'d code:1
#13: eval
	/home/bitrix/voench.ru/bitrix/modules/main/classes/mysql/agent.php:161
#14: CAgent::ExecuteAgents(string)
	/home/bitrix/voench.ru/bitrix/modules/main/classes/mysql/agent.php:38
#15: CAgent::CheckAgents()
	/home/bitrix/voench.ru/bitrix/modules/main/include.php:271
#16: require_once(string)
	/home/bitrix/voench.ru/bitrix/modules/main/include/prolog_before.php:14
#17: require_once(string)
	/home/bitrix/voench.ru/bitrix/modules/main/include/prolog.php:10
#18: require_once(string)
	/home/bitrix/voench.ru/bitrix/header.php:1
#19: require(string)
	/home/bitrix/voench.ru/people/user.php:2
#20: include_once(string)
	/home/bitrix/voench.ru/bitrix/modules/main/include/urlrewrite.php:159
#21: include_once(string)
	/home/bitrix/voench.ru/bitrix/urlrewrite.php:2