[TypeError] 
Return value of Vesper\Tools\Courses::checkDiscount() must be of the type array, null returned (0)
/var/www/vesperfin.com/local/modules/vesper.tools/lib/courses.php:110
#0: Vesper\Tools\Courses->checkDiscount
	/var/www/vesperfin.com/local/components/custom/courses.list/class.php:104
#1: CoursesListComponent->initResult
	/var/www/vesperfin.com/local/components/custom/courses.list/class.php:78
#2: CoursesListComponent->executeComponent
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component.php:656
#3: CBitrixComponent->includeComponent
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/main.php:1063
#4: CAllMain->IncludeComponent
	/var/www/vesperfin.com/local/components/custom/courses/templates/.default/section.php:24
#5: include(string)
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component_template.php:789
#6: CBitrixComponentTemplate->__IncludePHPTemplate
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component_template.php:884
#7: CBitrixComponentTemplate->IncludeTemplate
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component.php:764
#8: CBitrixComponent->showComponentTemplate
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component.php:712
#9: CBitrixComponent->includeComponentTemplate
	/var/www/vesperfin.com/local/components/custom/courses/class.php:143
#10: CoursesComponent->executeComponent
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/component.php:656
#11: CBitrixComponent->includeComponent
	/var/www/vesperfin.com/bitrix/modules/main/classes/general/main.php:1063
#12: CAllMain->IncludeComponent
	/var/www/vesperfin.com/courses/index.php:11
#13: include_once(string)
	/var/www/vesperfin.com/bitrix/modules/main/include/urlrewrite.php:159
#14: include_once(string)
	/var/www/vesperfin.com/bitrix/urlrewrite.php:2