diff --git a/app/controllers/file.php b/app/controllers/file.php
index 376a74e627b266c2fc9e8d9d6d2374066c6ca3cb..ddcef2c3a2dbb98b50e2e71d88ec1160c9deae47 100644
--- a/app/controllers/file.php
+++ b/app/controllers/file.php
@@ -1473,7 +1473,7 @@ class FileController extends AuthenticatedController
                 }
                 $payload = [
                     'html'     => FilesystemVueDataManager::getFileVueData($newfile, $this->current_folder),
-                    'redirect' => $redirects[0],
+                    'redirect' => $redirects[0] ?? '',
                     'url'      => $this->generateFilesUrl($this->current_folder, $newfile),
                 ];
 
diff --git a/app/controllers/my_courses.php b/app/controllers/my_courses.php
index d856ad4f8e3efb1cd40c0396f3ea99757f657797..187d6c6e438956d52b6092331b562ec0920ee305 100644
--- a/app/controllers/my_courses.php
+++ b/app/controllers/my_courses.php
@@ -475,6 +475,7 @@ class MyCoursesController extends AuthenticatedController
                     ));
                 }
             } else {
+                $prio_delete = false;
                 // LOGGING
                 StudipLog::log('SEM_USER_DEL', $course_id, $GLOBALS['user']->id, 'Hat sich selbst aus der Warteliste ausgetragen');
                 if ($course->isAdmissionEnabled()) {
diff --git a/app/views/questionnaire/question_types/vote/vote_evaluation.php b/app/views/questionnaire/question_types/vote/vote_evaluation.php
index bd6ce854ad5558b2df51a01b4fb8e923414130d4..b78ddc878a39fa515f0a4747fdc73391b5164c00 100644
--- a/app/views/questionnaire/question_types/vote/vote_evaluation.php
+++ b/app/views/questionnaire/question_types/vote/vote_evaluation.php
@@ -83,7 +83,12 @@ rsort($ordered_results);
 
 <table class="default nohover">
     <tbody>
-        <? $countAnswers = $vote->questionnaire->countAnswers() ?>
+        <?php
+            $countAnswers = 0;
+            if ($vote->questionnaire) {
+                $countAnswers = $vote->questionnaire->countAnswers();
+            }
+        ?>
         <? foreach ($options as $key => $answer) : ?>
         <tr>
             <? $percentage = ($countAnswers && isset($results[$key])) ? round((int) $results[$key] / $countAnswers * 100) : 0 ?>