diff --git a/main/inc/lib/agenda.lib.php b/main/inc/lib/agenda.lib.php
index 8bcc217046..e721627b27 100644
--- a/main/inc/lib/agenda.lib.php
+++ b/main/inc/lib/agenda.lib.php
@@ -4657,6 +4657,95 @@ class Agenda
         }
     }
 
+    /**
+     * @throws Exception
+     */
+    private function convertSessionWithDuration(int $userId, array $sessionInfo, DateTime $start, DateTime $end): array
+    {
+        $courseAccess = CourseManager::getFirstCourseAccessPerSessionAndUser(
+            $sessionInfo['session_id'],
+            $userId
+        );
+
+        if (empty($courseAccess)) {
+            throw new Exception();
+        }
+
+        $firstAccessDate = new DateTime($courseAccess['login_course_date'], new DateTimeZone('UTC'));
+        $lastAccessDate = clone $firstAccessDate;
+        $lastAccessDate->modify('+'.$sessionInfo['duration'].' days');
+
+        if ($firstAccessDate->format('Y-m-d H:i:s') > $start
+            && $lastAccessDate->format('Y-m-d H:i:s') < $end
+        ) {
+            throw new Exception();
+        }
+
+        $courseList = SessionManager::get_course_list_by_session_id($sessionInfo['id']);
+        $firstCourse = current($courseList);
+
+        return [
+            'id' => 'session_'.$sessionInfo['id'],
+            'session_id' => $sessionInfo['id'],
+            'title' => $sessionInfo['name'],
+            'description' => $sessionInfo['show_description'] ? $sessionInfo['description'] : '',
+            'className' => 'personal',
+            'borderColor' => $this->event_personal_color,
+            'backgroundColor' => $this->event_personal_color,
+            'editable' => false,
+            'sent_to' => get_lang('Me'),
+            'type' => 'session',
+            'start' => $firstAccessDate->format(DateTime::ISO8601),
+            'start_date_localtime' => api_get_local_time($firstAccessDate),
+            'end' => $lastAccessDate->format(DateTime::ISO8601),
+            'end_date_localtime' => api_get_local_time($lastAccessDate),
+            'allDay' => 0,
+            'parent_event_id' => 0,
+            'has_children' => 0,
+            'course_url' => api_get_course_url($firstCourse['code'], $sessionInfo['id']),
+        ];
+    }
+
+    /**
+     * @throws Exception
+     */
+    private function convertSessionWithDates(array $sessionInfo, DateTime $start, DateTime $end): array
+    {
+        if ($sessionInfo['display_start_date'] < $start
+            && $sessionInfo['display_end_date'] > $end
+        ) {
+            throw new Exception();
+        }
+
+        $courseList = SessionManager::get_course_list_by_session_id($sessionInfo['id']);
+        $firstCourse = current($courseList);
+
+        return [
+            'id' => 'session_'.$sessionInfo['id'],
+            'session_id' => $sessionInfo['id'],
+            'title' => $sessionInfo['name'],
+            'description' => $sessionInfo['show_description'] ? $sessionInfo['description'] : '',
+            'className' => 'personal',
+            'borderColor' => $this->event_personal_color,
+            'backgroundColor' => $this->event_personal_color,
+            'editable' => false,
+            'sent_to' => get_lang('Me'),
+            'type' => 'session_subscription',
+            'start' => $sessionInfo['display_start_date'],
+            'start_date_localtime' => $sessionInfo['display_start_date']
+                ? $this->formatEventDate($sessionInfo['display_start_date'])
+                : '',
+            'end' => $sessionInfo['display_end_date'],
+            'end_date_localtime' => $sessionInfo['display_end_date']
+                ? $this->formatEventDate($sessionInfo['display_end_date'])
+                : '',
+            'allDay' => 0,
+            'parent_event_id' => 0,
+            'has_children' => 0,
+            'course_url' => api_get_course_url($firstCourse['code'], $sessionInfo['id']),
+        ];
+    }
+
     private function loadSessionsAsEvents(int $start, int $end)
     {
         if (false === api_get_configuration_value('personal_calendar_show_sessions_occupation')) {
@@ -4670,85 +4759,24 @@ class Agenda
 
         foreach ($sessionList as $sessionInfo) {
             if (!empty($sessionInfo['duration'])) {
-                $courseAccess = CourseManager::getFirstCourseAccessPerSessionAndUser(
-                    $sessionInfo['session_id'],
-                    $userInfo['id']
-                );
-
-                if (empty($courseAccess)) {
+                try {
+                    $this->events[] = $this->convertSessionWithDuration($userInfo['id'], $sessionInfo, $start, $end);
+                } catch (Exception $e) {
                     continue;
                 }
 
-                $firstAccessDate = new DateTime($courseAccess['login_course_date'], new DateTimeZone('UTC'));
-                $lastAccessDate = clone $firstAccessDate;
-                $lastAccessDate->modify('+'.$sessionInfo['duration'].' days');
-
-                if ($firstAccessDate->format('Y-m-d H:i:s') > $start
-                    && $lastAccessDate->format('Y-m-d H:i:s') < $end
-                ) {
-                    continue;
-                }
-
-                $courseList = SessionManager::get_course_list_by_session_id($sessionInfo['id']);
-                $firstCourse = current($courseList);
-
-                $this->events[] = [
-                    'id' => 'session_'.$sessionInfo['id'],
-                    'session_id' => $sessionInfo['id'],
-                    'title' => $sessionInfo['name'],
-                    'description' => $sessionInfo['show_description'] ? $sessionInfo['description'] : '',
-                    'className' => 'personal',
-                    'borderColor' => $this->event_personal_color,
-                    'backgroundColor' => $this->event_personal_color,
-                    'editable' => false,
-                    'sent_to' => get_lang('Me'),
-                    'type' => 'session',
-                    'start' => $firstAccessDate->format(DateTime::ISO8601),
-                    'start_date_localtime' => api_get_local_time($firstAccessDate),
-                    'end' => $lastAccessDate->format(DateTime::ISO8601),
-                    'end_date_localtime' => api_get_local_time($lastAccessDate),
-                    'allDay' => 0,
-                    'parent_event_id' => 0,
-                    'has_children' => 0,
-                    'course_url' => api_get_course_url($firstCourse['code'], $sessionInfo['id']),
-                ];
-
                 continue;
             }
 
-            if ($sessionInfo['display_start_date'] < $start
-                && $sessionInfo['display_end_date'] > $end
-            ) {
+            if (empty($sessionInfo['display_start_date']) || empty($sessionInfo['display_end_date'])) {
                 continue;
             }
 
-            $courseList = SessionManager::get_course_list_by_session_id($sessionInfo['id']);
-            $firstCourse = current($courseList);
-
-            $this->events[] = [
-                'id' => 'session_'.$sessionInfo['id'],
-                'session_id' => $sessionInfo['id'],
-                'title' => $sessionInfo['name'],
-                'description' => $sessionInfo['show_description'] ? $sessionInfo['description'] : '',
-                'className' => 'personal',
-                'borderColor' => $this->event_personal_color,
-                'backgroundColor' => $this->event_personal_color,
-                'editable' => false,
-                'sent_to' => get_lang('Me'),
-                'type' => 'session_subscription',
-                'start' => $sessionInfo['display_start_date'],
-                'start_date_localtime' => $sessionInfo['display_start_date']
-                    ? $this->formatEventDate($sessionInfo['display_start_date'])
-                    : '',
-                'end' => $sessionInfo['display_end_date'],
-                'end_date_localtime' => $sessionInfo['display_end_date']
-                    ? $this->formatEventDate($sessionInfo['display_end_date'])
-                    : '',
-                'allDay' => 0,
-                'parent_event_id' => 0,
-                'has_children' => 0,
-                'course_url' => api_get_course_url($firstCourse['code'], $sessionInfo['id']),
-            ];
+            try {
+                $this->events[] = $this->convertSessionWithDates($sessionInfo, $start, $end);
+            } catch (Exception $e) {
+                continue;
+            }
         }
     }
 }