add

server/app/Http/Controllers/Api/V1/DreamController.php

@@ -424,7 +424,11 @@ class DreamController extends Controller
             }
             arsort($top);
             $new_arr = array_values($top);
-            $old_top_user_id = array_search($new_arr[0],$top);
+            if (!empty($new_arr)) {
+                $old_top_user_id = array_search($new_arr[0],$top);
+            }else{
+                $old_top_user_id = 0;
+            }
 
 
 
@@ -534,7 +538,11 @@ class DreamController extends Controller
         }
         arsort($top);
         $new_arr = array_values($top);
-        $top_user_id = array_search($new_arr[0],$top);
+        if (!empty($new_arr)) {
+            $top_user_id = array_search($new_arr[0],$top);
+        }else{
+            $top_user_id = $old_top_user_id;
+        }
         if ($top_user_id != $old_top_user_id) {   //新的最大支持者不是以前的最大支持者时
             $arr = [
                 'user_id'=>0,