[Baertram]

Edit the file /Core/EventViewers/_base.lua with a text editor
Add this line at line 173
if not color then return end

The function CombatCloud_EventViewer:PrepareLabel looks like this in the end

function CombatCloud_EventViewer:PrepareLabel(label, fontSize, color, text)
    label:SetText(text)
    if not color then return end
    label:SetColor(unpack(color))
    label:SetFont(format('%s|%d|%s', self.LMP:Fetch('font', CombatCloudSettings.fontFace), fontSize, CombatCloudSettings.fontOutline))
end

Hope it fixes the spam, as the unpack function says it cannot use the table "color" properly as it is nil. So adding a check before should abort before the error occurs.