diff --git a/HeroLib/Class/Item.lua b/HeroLib/Class/Item.lua
index 6e3a83dc..d02650cc 100755
--- a/HeroLib/Class/Item.lua
+++ b/HeroLib/Class/Item.lua
@@ -228,7 +228,10 @@ end
 function Item:BuffDuration()
   if not self:IsUsable() then return 0 end
   if not self:OnUseSpell() then return 0 end
-  local BuffLength = DBC.SpellDuration[self:OnUseSpell():ID()][1]
+  local BuffLength
+  if DBC.SpellDuration[self:OnUseSpell():ID()] then
+    BuffLength = DBC.SpellDuration[self:OnUseSpell():ID()][1]
+  end
   if not BuffLength then return 0 end
   if BuffLength > 1000 then BuffLength = BuffLength / 1000 end
   return BuffLength