fixed issue with undefined reservierung attributes

application/models/ressource/Reservierung_model.php

@@ -95,11 +95,12 @@ class Reservierung_model extends DB_Model
 
 		$query_result = $this->execReadOnlyQuery("
 		SELECT 
+		DISTINCT(insertvon),  
 		'reservierung' as type, beginn, ende, datum,
 		COALESCE(titel, beschreibung) as topic,
 		array_agg(DISTINCT mitarbeiter_kurzbz) as lektor,
 		array_agg(DISTINCT (gruppe,verband,semester,studiengang_kz,gruppen_kuerzel)) as gruppe, 
-		
+		array_agg(DISTINCT(uid)) as uids,
 		ort_kurzbz, 'FFFFFF' as farbe
 		
 		FROM 
@@ -107,7 +108,7 @@ class Reservierung_model extends DB_Model
 			" . $subquery . "
 		) AS subquery
 
-		GROUP BY datum, beginn, ende, ort_kurzbz, titel, beschreibung
+		GROUP BY datum, beginn, ende, ort_kurzbz, titel, beschreibung, insertvon
 		
 		ORDER BY datum, beginn
 		", [$uid ?? getAuthUID(), $start_date, $end_date]);