fix

app/controllers/project_rank_controller.rb

@@ -2,7 +2,8 @@ class ProjectRankController < ApplicationController
   # 根据时间获取热门项目
   def index 
     $redis_cache.zunionstore("recent-days-project-rank", get_timeable_key_names)
-    $redis_cache.zrem("recent-days-project-rank", $redis_cache.smembers("v2-project-rank-deleted"))
+    deleted_data = $redis_cache.smembers("v2-project-rank-deleted")
+    $redis_cache.zrem("recent-days-project-rank", deleted_data) unless deleted_data.blank?
     @project_rank = $redis_cache.zrevrange("recent-days-project-rank", 0, 4, withscores: true)
   rescue Exception => e
     @project_rank = []