[Error] 
Call to a member function getTimestamp() on boolean (0)
/home/bitrix/www/bitrix/php_interface/init.php:412
#0: setIfModifiedSince(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:475
#1: ExecuteModuleEventEx(array, array)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:3192
#2: CAllMain->EndBufferContent(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:3140
#3: CAllMain->EndBufferContentMan()
	/home/bitrix/www/bitrix/modules/main/include/epilog_after.php:36
#4: require(string)
	/home/bitrix/www/bitrix/modules/main/include/epilog.php:3
#5: require_once(string)
	/home/bitrix/www/bitrix/footer.php:4
#6: require(string)
	/home/bitrix/www/catalog/index.php:306
#7: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#8: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2