fix bug in archiv tab

application/controllers/api/frontend/v1/stv/Dokumente.php

@@ -753,6 +753,10 @@ class Dokumente extends FHCAPI_Controller
 		);
 
 		$data = $this->getDataOrTerminateWithError($result);
+		if(!(is_array($data) && count($data) > 0))
+		{
+			return null;
+		}
 		$student = current($data);
 
 		return $student->student_uid;

public/js/components/Stv/Studentenverwaltung/Details/Archiv.js

@@ -225,18 +225,32 @@ export default {
 			return events;
 		},
 		studentUids() {
-			if (this.modelValue.uid)
+			if(Array.isArray(this.modelValue))
+			{
+				return this.modelValue.map(e => e.uid);
+			}
+			else if (this.modelValue.uid)
 			{
 				return [this.modelValue.uid];
 			}
-			return this.modelValue.map(e => e.uid);
+			else
+			{
+				return [];
+			}
 		},
 		studentKzs(){
-			if (this.modelValue.uid)
+			if(Array.isArray(this.modelValue))
+			{
+				return this.modelValue.map(e => e.studiengang_kz);
+			}
+			else if (typeof this.modelValue.studiengang_kz !== 'undefined')
 			{
 				return [this.modelValue.studiengang_kz];
 			}
-			return this.modelValue.map(e => e.studiengang_kz);
+			else
+			{
+				return [];
+			}
 		},
 		stg_kz(){
 			return this.studentKzs[0];