Fix phpstan #540

Job	Run time
Run on Linux (test:e2e, test/front_login)	4m 26s
Run on Linux (test:e2e, test/front_guest)	3m 0s
Installer test (pgsql, 5.4)	21s
Run on Linux (test:e2e, test/admin)	3m 41s
Installer test (pgsql, 5.5)	15s
Installer test (pgsql, 5.6)	13s
Run on Linux (test:e2e-extends, test/front_login)	3m 24s
Installer test (pgsql, 7.0)	15s
Run on Linux (test:e2e-extends, test/front_guest)	2m 59s
Installer test (pgsql, 7.1)	3m 21s
Run on Linux (test:e2e-extends, test/admin)	3m 4s
Installer test (pgsql, 7.2)	3m 16s
Installer test (pgsql, 7.3)	3m 3s
Installer test (pgsql, 7.4)	2m 51s
Installer test (pgsql, 8.0)	3m 37s
Installer test (pgsql, 8.1)	15s
Installer test (pgsql, 8.2)	28s
Installer test (mysql, 5.4)	25s
Installer test (mysql, 5.5)	24s
Installer test (mysql, 5.6)	15s
Installer test (mysql, 7.0)	17s
Installer test (mysql, 7.1)	3m 43s
Installer test (mysql, 7.2)	3m 43s
Installer test (mysql, 7.3)	3m 21s
Installer test (mysql, 7.4)	3m 32s
Installer test (mysql, 8.0)	3m 15s
Installer test (mysql, 8.1)	24s
Installer test (mysql, 8.2)	13s
	58m 1s

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