[Eungavi]

So, I'm currently trying to make a button that cancels aura on right mouse button and here's what I've got atm

local button = CreateFrame("Button", nil, UIParent, "SecureHandlerClickTemplate");
button:RegisterEvent("PLAYER_ENTERING_WORLD");
button:RegisterUnitEvent("UNIT_AURA", "player");
button:RegisterForClicks("RightButtonUp");
button:SetSize(50, 50);
button:SetPoint("TOP", 0, -150);
button:SetScript("OnEvent", function(self, event, ...)
    if event == "PLAYER_ENTERING_WORLD" or event == "UNIT_AURA" then
        if event == "PLAYER_ENTERING_WORLD" then
            self:UnregisterEvent("PLAYER_ENTERING_WORLD");
        end
 
        local spellName = GetSpellInfo(self.spellID);
 
        local _, _, _, count, _, duration, expires = UnitBuff("player", spellName);
 
        local cd = self.cd;
        if duration and duration > 0 then
            cd:SetCooldown(expires - duration, duration);
            cd:Show();
 
            self.icon:SetDesaturated(false);
 
            self.duration = duration;
        else
            cd:Hide();
 
            self.icon:SetDesaturated(true);
 
            self.duration = nil;
        end
 
        self.count:SetText((count and count > 1) and count or "");
    end
end);
button:SetAttribute("_onclick", [=[
    if button == "RightButton" and not down then
        local name = self:GetAttribute("spellName");
 
        local cd = self:GetFrameRef("cd");
        
        if cd:IsShown() then
            CancelUnitBuff("player", name);
        end
    end
]=]);
 
button.spellID = 241846;
button:SetAttribute("spellName", GetSpellInfo(button.spellID));
 
local cd = CreateFrame("Cooldown", nil, button, "CooldownFrameTemplate");
cd:SetAllPoints(button);
cd:SetReverse(true);
cd:SetDrawEdge(true);
cd:SetHideCountdownNumbers(false);
 
button:SetFrameRef("cd", cd);

It currently fails at L#42 where I check cd's visibility.

Would that be because cd itself is not a SecureHandler template object?