[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT USER_ID FROM b_user_counter WHERE SENT='0' GROUP BY USER_ID LIMIT 100
/home/a/azmed/test/public_html/bitrix/modules/main/lib/db/mysqlcommonconnection.php:417
#0: Bitrix\Main\DB\MysqlCommonConnection->createQueryException(integer, string, string)
	/home/a/azmed/test/public_html/bitrix/modules/main/classes/general/database.php:683
#1: CAllDatabase->Query(string)
	/home/a/azmed/test/public_html/bitrix/modules/main/classes/general/user_counter_page.php:89
#2: CUserCounterPage::checkSendCounter()
	/home/a/azmed/test/public_html/bitrix/modules/main/classes/general/main.php:3735
#3: CMain::RunFinalActionsInternal()
	/home/a/azmed/test/public_html/bitrix/modules/main/lib/Application.php:421
#4: Bitrix\Main\Application->terminate(integer)
	/home/a/azmed/test/public_html/bitrix/modules/main/lib/Application.php:382
#5: Bitrix\Main\Application->end()
	/home/a/azmed/test/public_html/bitrix/modules/main/classes/general/main.php:3711
#6: CMain::FinalActions(string)
	/home/a/azmed/test/public_html/bitrix/modules/main/include/epilog_after.php:61
#7: require(string)
	/home/a/azmed/test/public_html/bitrix/modules/main/include/epilog.php:3
#8: require_once(string)
	/home/a/azmed/test/public_html/bitrix/footer.php:4
#9: require(string)
	/home/a/azmed/test/public_html/catalog/index.php:679
#10: include_once(string)
	/home/a/azmed/test/public_html/bitrix/modules/main/include/urlrewrite.php:128
#11: include_once(string)
	/home/a/azmed/test/public_html/bitrix/urlrewrite.php:2
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