diff --git a/webapp/controller/SoloController.class.php b/webapp/controller/SoloController.class.php
index a078519..dc81424 100644
--- a/webapp/controller/SoloController.class.php
+++ b/webapp/controller/SoloController.class.php
@@ -506,10 +506,10 @@ class SoloController
         }
 
         $foundwave = false;
-        foreach ($gamelevel['levelinfo'][$level] as $key => $waveitem) {
+        foreach ($gamelevel['levelinfo'][$level] as $waveitem) {
             if ($wave == $waveitem) {
                 $foundwave = true;
-                unset($gamelevel['levelinfo'][$level][$key]);
+                $gamelevel['levelinfo'][$level] = array_diff($gamelevel['levelinfo'][$level], [$waveitem]);
                 if (count($gamelevel['levelinfo'][$level]) == 0) {
                     unset($gamelevel['levelinfo'][$level]);
                 }