prevent many warnings regarding php8 on main, fixes #4631

Closes #4631

Merge request studip/studip!3448

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/classes/coursewizardsteps/BasicDataWizardStep.php b/lib/classes/coursewizardsteps/BasicDataWizardStep.php
index bca6915..53c8c50 100644
--- a/lib/classes/coursewizardsteps/BasicDataWizardStep.php
+++ b/lib/classes/coursewizardsteps/BasicDataWizardStep.php
@@ -556,9 +556,10 @@ class BasicDataWizardStep implements CourseWizardStep
         return [];
     }
 
-    public function getSearch($course_type, $institute_ids, $exclude_lecturers = [],$exclude_tutors = [])
+    public function getSearch($course_type)
     {
-        if (SeminarCategories::getByTypeId($course_type)->only_inst_user) {
+        $category = SeminarCategories::getByTypeId($course_type);
+        if ($category && $category->only_inst_user) {
             $search = 'user_inst';
         } else {
             $search = 'user';