diff --git a/webapp/controller/SoloController.class.php b/webapp/controller/SoloController.class.php
index dc81424..89b1ca0 100644
--- a/webapp/controller/SoloController.class.php
+++ b/webapp/controller/SoloController.class.php
@@ -506,14 +506,12 @@ class SoloController
         }
 
         $foundwave = false;
+        $newlist = array();
         foreach ($gamelevel['levelinfo'][$level] as $waveitem) {
             if ($wave == $waveitem) {
                 $foundwave = true;
-                $gamelevel['levelinfo'][$level] = array_diff($gamelevel['levelinfo'][$level], [$waveitem]);
-                if (count($gamelevel['levelinfo'][$level]) == 0) {
-                    unset($gamelevel['levelinfo'][$level]);
-                }
-                break;
+            } else {
+                $newlist[] = $waveitem;
             }
         }
 
@@ -528,6 +526,12 @@ class SoloController
             return;
         }
 
+        if (count($newlist) == 0) {
+            unset($gamelevel['levelinfo'][$level]);
+        } else {
+            $gamelevel['levelinfo'][$level] = $newlist;
+        }
+
         $wavearr = explode('|', $levelcfg['completionwave']);
         $foundwave = false;
         $item_list = array();