Hotfix for issue with navigation for users who do not have view rights for one of the level 1 categories

classes/local/helpers/webservicehelper.php

@@ -74,6 +74,12 @@ class webservicehelper {
         // Initialize parent if needed.
         if ($parent == null) {
             $parent = \core_course_category::user_top();
+
+            if ($parent == null) {
+                // If the parent is still null, we do not have a valid user top.
+                return false;
+            }
+
             if (has_capability($capability, $parent->get_context())) {
                 $list[] = $parent;
             }

version.php

@@ -25,7 +25,7 @@ $plugin->component = 'local_treestudyplan';  // Recommended since 2.0.2 (MDL-260
 /* IMPORTANT: For studyplan-10 branch, only increment the iteration part of the version below
    since this is a bugfix branch
  */
-$plugin->version = 2023090701;  // YYYYMMDDHH (year, month, day, iteration).
+$plugin->version = 2023090702;  // YYYYMMDDHH (year, month, day, iteration).
 $plugin->requires = 2021051700; // YYYYMMDDHH (This is the release version for Moodle 3.11).
 
 $plugin->release = "1.0.1";