Error Log file shows "User user_elgg491 already has more than 'max_user_connections' active connections"

I was going through my error log file and I found the below error logs repeating again and again for past one month.

[13-Sep-2017 07:21:31 Asia/Kolkata] Exception at time 1505267491: PDOException: SQLSTATE[HY000] [1203] User user_elgg491 already has more than 'max_user_connections' active connections in /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:43 
Stack trace: 
#0 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(43): PDO->__construct('mysql:host=loca...', 'user_elgg491', '********', Array) 
#1 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(41): Doctrine\DBAL\Driver\PDOConnection->__construct('mysql:host=loca...', 'user_elgg491', '********', Array) 
#2 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, 'user_elgg491', '********', Array) 
#3 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(1036): Doctrine\DBAL\Connection->connect() 
#4 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(176): Doctrine\DBAL\Connection->exec('SET SESSION sql...') 
#5 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(143): Elgg\Database->connect('readwrite') 
#6 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/BootService.php(44): Elgg\Database->setupConnections() 
#7 /home/user/public_html/vendor/elgg/elgg/engine/lib/elgglib.php(2183): Elgg\BootService->boot() 
#8 [internal function]: Elgg\Application->{closure}('boot', 'system', NULL) 
#9 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/EventsService.php(113): call_user_func_array(Object(Closure), Array) 
#10 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(267): Elgg\EventsService->trigger('boot', 'system') 
#11 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application/CacheHandler.php(131): Elgg\Application->bootCore() 
#12 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(409): Elgg\Application\CacheHandler->handleRequest('/cache/15052299...') 
#13 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(384): Elgg\Application->run() 
#14 /home/user/public_html/index.php(8): Elgg\Application::index() 
#15 {main} 

Next Doctrine\DBAL\Driver\PDOException: SQLSTATE[HY000] [1203] User user_elgg491 already has more than 'max_user_connections' active connections in /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:47 
Stack trace: 
#0 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(41): Doctrine\DBAL\Driver\PDOConnection->__construct('mysql:host=loca...', 'user_elgg491', '********', Array) 
#1 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, 'user_elgg491', '********', Array) 
#2 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(1036): Doctrine\DBAL\Connection->connect() 
#3 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(176): Doctrine\DBAL\Connection->exec('SET SESSION sql...') 
#4 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(143): Elgg\Database->connect('readwrite') 
#5 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/BootService.php(44): Elgg\Database->setupConnections() 
#6 /home/user/public_html/vendor/elgg/elgg/engine/lib/elgglib.php(2183): Elgg\BootService->boot() 
#7 [internal function]: Elgg\Application->{closure}('boot', 'system', NULL) 
#8 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/EventsService.php(113): call_user_func_array(Object(Closure), Array) 
#9 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(267): Elgg\EventsService->trigger('boot', 'system') 
#10 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application/CacheHandler.php(131): Elgg\Application->bootCore() 
#11 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(409): Elgg\Application\CacheHandler->handleRequest('/cache/15052299...') 
#12 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(384): Elgg\Application->run() 
#13 /home/user/public_html/index.php(8): Elgg\Application::index() 
#14 {main} 

Next Doctrine\DBAL\Exception\DriverException: An exception occured in driver: SQLSTATE[HY000] [1203] User user_elgg491 already has more than 'max_user_connections' active connections in /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:115 
Stack trace: 
#0 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php(145): Doctrine\DBAL\Driver\AbstractMySQLDriver->convertException('An exception oc...', Object(Doctrine\DBAL\Driver\PDOException)) 
#1 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(47): Doctrine\DBAL\DBALException::driverException(Object(Doctrine\DBAL\Driver\PDOMySql\Driver), Object(Doctrine\DBAL\Driver\PDOException)) 
#2 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, 'user_elgg491', '********', Array) 
#3 /home/user/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(1036): Doctrine\DBAL\Connection->connect() 
#4 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(176): Doctrine\DBAL\Connection->exec('SET SESSION sql...') 
#5 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Database.php(143): Elgg\Database->connect('readwrite') 
#6 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/BootService.php(44): Elgg\Database->setupConnections() 
#7 /home/user/public_html/vendor/elgg/elgg/engine/lib/elgglib.php(2183): Elgg\BootService->boot() 
#8 [internal function]: Elgg\Application->{closure}('boot', 'system', NULL) 
#9 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/EventsService.php(113): call_user_func_array(Object(Closure), Array) 
#10 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(267): Elgg\EventsService->trigger('boot', 'system') 
#11 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application/CacheHandler.php(131): Elgg\Application->bootCore() 
#12 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(409): Elgg\Application\CacheHandler->handleRequest('/cache/15052299...') 
#13 /home/user/public_html/vendor/elgg/elgg/engine/classes/Elgg/Application.php(384): Elgg\Application->run() 
#14 /home/user/public_html/index.php(8): Elgg\Application::index() 
#15 {main} 

I am not able to identify which process is creating this problem.

Any help from the community? What should I do?