diff --git a/adm_program/installation/db_scripts/update_4_3.xml b/adm_program/installation/db_scripts/update_4_3.xml
index 3dcee1afc..de69e8366 100644
--- a/adm_program/installation/db_scripts/update_4_3.xml
+++ b/adm_program/installation/db_scripts/update_4_3.xml
@@ -123,5 +123,6 @@
     <step id="1220" database="mysql">UPDATE %PREFIX%_preferences SET prf_value = '24' WHERE prf_name = 'photo_thumbs_page' AND CAST(prf_value AS unsigned) = 16</step>
     <step id="1230" database="pgsql">UPDATE %PREFIX%_preferences SET prf_value = '24' WHERE prf_name = 'photo_thumbs_page' AND prf_value::int = 16</step>
     <step id="1240">UPDATE %PREFIX%_categories SET cat_type = 'EVT' WHERE cat_type = 'DAT'</step>
+    <step id="1250">UPDATE %PREFIX%_categories SET cat_org_id = 1 WHERE cat_org_id IS NULL AND cat_name_intern = 'EVENTS'</step>
     <step>stop</step>
 </update>
diff --git a/adm_program/modules/events/events_function.php b/adm_program/modules/events/events_function.php
index d2b348f6c..db0374996 100644
--- a/adm_program/modules/events/events_function.php
+++ b/adm_program/modules/events/events_function.php
@@ -356,11 +356,14 @@
                      WHERE cat_name_intern = \'EVENTS\'
                        AND cat_org_id = ?';
                     $pdoStatement = $gDb->queryPrepared($sql, array($gCurrentOrgId));
+                    if(!$row = $pdoStatement->fetch()) {
+                        throw new AdmException('No category found for event participation');
+                    }
                     $role = new TableRoles($gDb);
                     $role->setType(TableRoles::ROLE_EVENT);
 
                     // these are the default settings for a event role
-                    $role->setValue('rol_cat_id', (int)$pdoStatement->fetchColumn());
+                    $role->setValue('rol_cat_id', (int) $row['cat_id']);
                     // role members are allowed to view lists
                     $role->setValue('rol_view_memberships', isset($_POST['event_right_list_view']) ? 1 : 3);
                     // role members are allowed to send mail to this role