I keep getting this message when I click the button to finish my pets' training. It happens on multiple pets, using Chrome.

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction in /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php:474 Stack trace: /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php(474): PDOStatement->execute() /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php(640): IlluminateDatabaseConnection->IlluminateDatabase{closure}('update pets s...', Array) /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php(607): IlluminateDatabaseConnection->runQueryCallback('update pets s...', Array, Object(Closure)) /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php(477): IlluminateDatabaseConnection->run('update pets s...', Array, Object(Closure)) /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php(416): IlluminateDatabas in /var/app/current/vendor/agogeinc/subeta-filter/vendor/illuminate/database/Connection.php on line 647