diff --git a/modules/hdgraphic.lua b/modules/hdgraphic.lua
index d999c9e9..9147513d 100644
--- a/modules/hdgraphic.lua
+++ b/modules/hdgraphic.lua
@@ -1,6 +1,12 @@
 pfUI:RegisterModule("hdgraphic", "vanilla", function ()
-  -- inject video settings to provide advanced slider values
-  _G.OptionsFrameSliders[3].maxValue = 15
+  -- inject video settings to provide advanced slider values (deferred until frame is shown)
+  local origOptionsFrame_OnShow = OptionsFrame_OnShow
+  function OptionsFrame_OnShow()
+    if origOptionsFrame_OnShow then origOptionsFrame_OnShow() end
+    if _G.OptionsFrameSliders and _G.OptionsFrameSliders[3] then
+      _G.OptionsFrameSliders[3].maxValue = 15
+    end
+  end
   local HookSetWorldDetail = SetWorldDetail
   function _G.SetWorldDetail(arg)
     HookSetWorldDetail((arg > 2 and 2 or arg))
@@ -37,4 +43,4 @@ pfUI:RegisterModule("hdgraphic", "vanilla", function ()
     local frill = tonumber(GetCVar("frillDensity"))
     return frill > 48 and frill/16-1 or HookGetWorldDetail()
   end
-end)
+end)
\ No newline at end of file