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Database Exceptionyii\db\Exception

SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
The SQL being executed was: SELECT
`kcu`.`CONSTRAINT_NAME` AS `constraint_name`,
`kcu`.`COLUMN_NAME` AS `column_name`,
`kcu`.`REFERENCED_TABLE_NAME` AS `referenced_table_name`,
`kcu`.`REFERENCED_COLUMN_NAME` AS `referenced_column_name`
FROM `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`
JOIN `information_schema`.`KEY_COLUMN_USAGE` AS `kcu` ON
(
`kcu`.`CONSTRAINT_CATALOG` = `rc`.`CONSTRAINT_CATALOG` OR
(`kcu`.`CONSTRAINT_CATALOG` IS NULL AND `rc`.`CONSTRAINT_CATALOG` IS NULL)
) AND
`kcu`.`CONSTRAINT_SCHEMA` = `rc`.`CONSTRAINT_SCHEMA` AND
`kcu`.`CONSTRAINT_NAME` = `rc`.`CONSTRAINT_NAME`
WHERE `rc`.`CONSTRAINT_SCHEMA` = database() AND `kcu`.`TABLE_SCHEMA` = database()
AND `rc`.`TABLE_NAME` = 'dict_list' AND `kcu`.`TABLE_NAME` = 'dict_list'

Error Info: Array
(
    [0] => HY000
    [1] => 2006
    [2] => MySQL server has gone away
)
$_GET = [
    'slug' => 'big_soviet_enc',
    'id' => '90553',
];