Update to OTRS 6

Hi everyone,

I am trying to perform an update to OTRS 6 from the latest OTRS 5 stable 
release but when I try to run the DB Update script I receive this error:

     Step 16 of 33: Add basic appointment notification for reminders ...
[Thu Oct 12 11:42:25 2017] DBUpdate-to-6.pl: DBD::mysql::db do failed: 
Incorrect string value: '\xE2\x96\xA0</s...' for column 'text' at row 1 
at 
/home/otrs/domains/support.crazynetwork.it/private_html/Kernel/System/DB.pm 
line 470.
ERROR: OTRS-otrs.Console.pl-Maint::Database::Check-00 Perl: 5.16.3 OS: 
linux Time: Thu Oct 12 11:42:25 2017

  Message: Incorrect string value: '\xE2\x96\xA0</s...' for column 
'text' at row 1, SQL: '
                 INSERT INTO notification_event_message
                     (notification_id, subject, text, content_type, 
language)
                 VALUES (?, ?, ?, ?, ?)'

  Traceback (16155):
    Module: Kernel::System::NotificationEvent::NotificationAdd Line: 404
    Module: 
scripts::DBUpdateTo6::AddAppointmentCalendarNotification::Run Line: 162
    Module: scripts::DBUpdateTo6::_ExecuteComponent Line: 157
    Module: scripts::DBUpdateTo6::Run Line: 69
    Module: ./DBUpdate-to-6.pl Line: 82


My system specs are:

mysql  Ver 15.1 Distrib 10.2.9-MariaDB, for Linux (x86_64) using 
readline 5.1
Server version: Apache/2.4.28 (Unix)
nginx version: nginx/1.13.5 (As proxy to Apache)


Does anyone can help me out with this?


Thanks

Best regards
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