Chamilo LMS

From a few weeks ago we noticed in our Chamilo 1.9.2 platform that some events in some courses were dissapearing.
Today I found the answer to this problem.

When you delete an event from your course agenda, in the code the c_id reference is not specified in the sql query, so, if you delete an event with id=1, all the events from all courses with the event id=1 are deleted. It also happens when you edit an event.

To solve this I changed the following:

File: main/calendar/agenda.lib.php

Line 187, code should be:
case 'course':
$id_curso=api_get_course_int_id();
$attributes['title'] = $title;
$attributes['content'] = $content;
$attributes['start_date'] = $start;
$attributes['end_date'] = $end;
//Database::update($this->tbl_course_agenda, $attributes, array('id = ?' => $id));
Database::update($this->tbl_course_agenda, $attributes, array('id = ? AND c_id = ?' =>array($id,$id_curso)));
break;

Line 212, code should be:
case 'course':
$id_curso=api_get_course_int_id();
Database::delete($this->tbl_course_agenda, array('id = ? AND c_id = ?' =>array($id,$id_curso)));
//Database::delete($this->tbl_course_agenda, array('id = ?' =>$id));
break;

I was going crazy with this problem, I hope it helps you :)