Spawnframes.lua bad argument #1 to 'match' (string expected, got nil)

This error showed up upon creating a party via the group finder.

Via Bugsack: 2x SpartanUI\modules\UnitFrames\SpawnFrames.lua:235: bad argument #1 to 'match' (string expected, got nil)

[string "@FrameXML\RestrictedFrames.lua"]:673: in function <FrameXML\RestrictedFrames.lua:672> [string "@FrameXML\RestrictedFrames.lua"]:811: in function `CallMethod' [string " local header = self:GetParent() local frames = table.new() table.insert(frames, self) self:GetChildList(frames) for i = 1, #frames do local frame = frames[i] local unit -- There's no need to do anything on frames with onlyProcessChildren if(not frame:GetAttribute('oUF-onlyProcessChildren')) then RegisterUnitWatch(frame)

            -- Attempt to guess what the header is set to spawn.
            local groupFilter = header:GetAttribute('groupFilter')

            if(type(groupFilter) == 'string' and groupFilter:match('MAIN[AT]')) then
                local role = groupFilter:match('MAIN([AT])')
                if(role == 'T') then
                    unit = 'maintank'
                else
                    unit = 'mainassist'
                end
            elseif(header:GetAttribute('showRaid')) then
                unit = 'raid'
            elseif(header:GetAttribute('showParty')) then
                unit = 'party'
            end

            local headerType = header:GetAttribute('oUF-headerType')
            local suffix = frame:GetAttribute('unitsuffix')
            if(unit and suffix) then
                if(headerType == 'pet' and suffix == 'target') then
                    unit = unit .. headerType .. suffix
                else
                    unit = unit .. suffix
                end
            elseif(unit and headerType == 'pet') then
                unit = unit .. headerType
            end

            frame:SetAttribute('*type1', 'target')
            frame:SetAttribute('*type2', 'togglemenu')
            frame:SetAttribute('oUF-guessUnit', unit)
        end

        local body = header:GetAttribute('oUF-initialConfigFunction')
        if(body) then
            frame:Run(body, unit)
        end
    end

    header:CallMethod('styleFunction', self:GetName())

    local clique = header:GetFrameRef('clickcast_header')
    if(clique) then
        clique:SetAttribute('clickcast_button', self)
        clique:RunAttribute('clickcast_register')
    end
"]:51: in function <[string "       local header = self:GetParent()..."]:1>

[string "@FrameXML\RestrictedExecution.lua"]:484: in function <FrameXML\RestrictedExecution.lua:447> [string "@FrameXML\SecureGroupHeaders.lua"]:116: in function <FrameXML\SecureGroupHeaders.lua:110> [string "@FrameXML\SecureGroupHeaders.lua"]:173: in function <FrameXML\SecureGroupHeaders.lua:130> [string "@FrameXML\SecureGroupHeaders.lua"]:406: in function <FrameXML\SecureGroupHeaders.lua:394> string "=[C]": in function `Show' [string "@FrameXML\SecureStateDriver.lua"]: 100 : in function <FrameXML\SecureStateDriver.lua:95> [string "@FrameXML\SecureStateDriver.lua"]:127: in function <FrameXML\SecureStateDriver.lua:119>

EDIT: spaced the semicolons around the 100 on second to last line to prevent an emoji (:100:), because that's a Thing for some reason.

Wutname1 / SpartanUI

Spawnframes.lua bad argument #1 to 'match' (string expected, got nil) #388