From 632b9bb9b4b59b38ea69c7c49faa9bdfb828f617 Mon Sep 17 00:00:00 2001
From: Jan-Hendrik Willms <tleilax+github@gmail.com>
Date: Wed, 30 Aug 2023 09:26:53 +0200
Subject: [PATCH] re #3106

---
 lib/classes/coursewizardsteps/BasicDataWizardStep.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/classes/coursewizardsteps/BasicDataWizardStep.php b/lib/classes/coursewizardsteps/BasicDataWizardStep.php
index 100786b0573..4f424e817ba 100644
--- a/lib/classes/coursewizardsteps/BasicDataWizardStep.php
+++ b/lib/classes/coursewizardsteps/BasicDataWizardStep.php
@@ -344,7 +344,7 @@ class BasicDataWizardStep implements CourseWizardStep
         if (!trim($values['name'])) {
             $errors[] = _('Bitte geben Sie den Namen der Veranstaltung an.');
         }
-        if (!empty($values['number'])) {
+        if (isset($values['number']) && $values['number'] != '') {
             $course_number_format = Config::get()->COURSE_NUMBER_FORMAT;
             if ($course_number_format && !preg_match('/^' . $course_number_format . '$/', $values['number'])) {
                 $errors[] = _('Die Veranstaltungsnummer hat ein ungültiges Format.');
-- 
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