Gantt crashing with UTF-8 characters


When retrieving fields from my SQL database, I noticed the Gantt cannot be displayed if the string names contain characters like é è à …
The characters are stored in a utf8_unicode_ci table in the database, and the header of my HTML page is :

Are you aware of this issue?
Please note when I modify a name from the Gantt interface, the stored accents are in Unicode (like é )

make sure that database and tables encoding is set to UTF-8 as well. There also may be content encoding of server-side handler which returns the database data to the client