Guard forced Show() to frames already shown naturally by the game

HideCoA.lua

@@ -45,6 +45,7 @@ local function ShouldHideForClass(playerClass, frameName)
 end
 
 local hookedFrames = {}
+local seenNaturalShow = {}
 
 local function ApplySetting()
 
@@ -59,6 +60,7 @@ local function ApplySetting()
             if not hookedFrames[frameName] then
 
                 frame:HookScript("OnShow", function(self)
+                    seenNaturalShow[frameName] = true
                     local _, currentClass = UnitClass("player")
                     if ShouldHideForClass(currentClass, frameName) then
                         self:Hide()
@@ -73,7 +75,12 @@ local function ApplySetting()
 
             if hide then
                 frame:Hide()
-            else
+            elseif seenNaturalShow[frameName] then
+                -- The server never Show()s a frame the current class doesn't use,
+                -- so its data (powerType, maxValue, ...) is never populated. Forcing
+                -- Show() on it exposes that uninitialized state and crashes the
+                -- server's own OnUpdate handler. Only force-show a frame we've
+                -- already seen the game display naturally at least once.
                 frame:Show()
             end