Thanks @KevinTheJedi,
I checked on the DB and a query for the tables using Myisam gives an empty result:
The same query filtering Innodb tables returns all the tables of Osticket:
Concerning the dumping of variable in the setTicketStatus() function, which variables should I dump exactly, and how?
There are any other logs on the machine that I could examine, like apache logs?
Thanks in advance for your support.