4.2.2 not creating database table

I upgrade to 4.2.2 and now my plugin doesn’t create tables when its activated.

My plugin created tables when it was activate when I was on 4.1.2.

register_activation_hook( __FILE__, array( $this, 'my_table' ) );

and

public function my_table() {
global $wpdb;

$charset_collate = $wpdb->get_charset_collate();
$table_name = $wpdb->myTable;

if($wpdb->get_var("show tables like '$table_name'") != $table_name) {
$sql = "CREATE TABLE $table_name (
id mediumint(9) NOT NULL AUTO_INCREMENT,
status varchar(8) NOT NULL,
creation_time DATETIME DEFAULT CURRENT_TIMESTAMP,
modification_time DATETIME ON UPDATE CURRENT_TIMESTAMP,
UNIQUE KEY id (id)
) $charset_collate;";

require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $sql );
}
}

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