Adding c_id to query see #5720 fix provided by Jose Abuin

main/calendar/agenda.lib.php

@@ -185,11 +185,14 @@ class Agenda {
 				Database::update($this->tbl_personal_agenda, $attributes, array('id = ?' => $id));
 				break;
 			case 'course':
+                $course_id = 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 = ?' => $id));
+                if (!empty($course_id)) {
+                    Database::update($this->tbl_course_agenda, $attributes, array('id = ? AND c_id = ?' => array($id, $course_id)));
+                }
 				break;
 			case 'admin':
 				$attributes['title'] 		= $title;
@@ -208,7 +211,10 @@ class Agenda {
 				Database::delete($this->tbl_personal_agenda, array('id = ?' => $id));
 				break;
 			case 'course':
-				Database::delete($this->tbl_course_agenda, array('id = ?' =>$id));
+                $course_id = api_get_course_int_id();
+                if (!empty($course_id)) {
+                    Database::delete($this->tbl_course_agenda, array('id = ? AND c_id = ?' => array($id, $course_id)));
+                }
 				break;
 			case 'admin':
 				Database::delete($this->tbl_global_agenda, array('id = ?' => $id));