diff --git a/app/Actions/SupervisorMaker.php b/app/Actions/SupervisorMaker.php
index adfa39ac..d1801dc5 100644
--- a/app/Actions/SupervisorMaker.php
+++ b/app/Actions/SupervisorMaker.php
@@ -29,7 +29,7 @@ class SupervisorMaker
 
             $parts = [];
             $parts[] = 'p'.$supervisor->id;
-            if ($supervisor->sport->name) {
+            if (isset($supervisor->sport->name)) {
                 $parts[] = self::fix_string($supervisor->sport->name);
             } else {
                 $parts[] = 'all';