ISPConfig installer and sql-mode error

Hi, I'm trying to install ISPConfing on a Percona Server 5.7. The default Percona Server SQL Mode is STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION:

mysql> SELECT @@sql_mode; +--------------------------------------------+ | @@sql_mode | +--------------------------------------------+ | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | +--------------------------------------------+ 1 row in set (0.00 sec)

Anyway the ISPConfig Installation gives the following error:

Wrong SQL-mode. You should use NO_ENGINE_SUBSTITUTION. Add

sql-mode="NO_ENGINE_SUBSTITUTION"

It's happening on a Ubuntu 16.4.4 Server and latest ISPConfig 3.1 dev, with Percona Server 5.7

Thanks