Sideview脚本的CP条更新出错

love4567536

1. #--------------------------------------------------------------------------
   
2.   # ● CP条更新
   
3.   #--------------------------------------------------------------------------
   
4.   def refresh_cp
   
5.     @blank_window.x = 128 - @info_viewport.ox   
   
6.     @basepic.x = 144 - @info_viewport.ox   
   
7.     for iii in $game_party.members + $game_troop.members
   
8.       if iii.is_a?(Game_Actor)
   
9.         icon_index = $data_weapons[iii.weapon_id].icon_index
   
10.         @cppic[iii].src_rect.set(icon_index % 16 * 24, icon_index / 16 * 24, 24, 24)
    
11.       else
    
12.         @cppic[iii].src_rect.set(312, 216, 24, 24)
    
13.       end
    
14.       if iii.hp > 0
    
15.         @cppic[iii].visible = $CP可见
    
16.       else
    
17.         @cppic[iii].visible = false
    
18.       end
    
19.       @cppic[iii].x = 132 + (iii.cp * 384 / 5000).to_i - @info_viewport.ox
    
20.     end
    
21.   end
    
22.   #--------------------------------------------------------------------------

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开始战斗后就会弹出：脚本 'Siddeview 3' 的第81行发生了NoMethodError . undefined method 'icon_index'for nil:NilClass

是因为什么原因啊？麻烦大家帮我看看，谢谢啦！