Lines 843 and 998 are the culprits, roll instead of role.

	if ( groupFilter ) then
		-- filtering by a list of group numbers and/or classes
		fillTable(tokenTable, strsplit(",", groupFilter));
		local strictFiltering = self:GetAttribute("strictFiltering"); -- non-strict by default
		for i = 1, GetNumRaidMembers(), 1 do
			local name, _, subgroup, _, _, className, _, _, _, role = GetRaidRosterInfo(i);
			local unit = unitPrefix..i;
			if ( filterOnPet ) then
				name = UnitName(unit);
			end
			if ( UnitExists("raidpet"..i) ) then
				if ( name and
				     ((not strictFiltering) and 
				      (tokenTable[subgroup] or tokenTable[className] or (role and tokenTable[roll])) -- non-strict filtering
					 ) or 
					  (tokenTable[subgroup] and tokenTable[className]) -- strict filtering
				) then

Check the line (tokenTable[subgroup] or tokenTable[className] or (role and tokenTable[roll])) -- non-strict filtering.

Where did roll come from? typos for the loss.

Please fix this. I'm trying to implement MAINTANK and MAINASSIST frames in PitBull.

[ Post edited by Ckknight ]

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This is already fixed for 2.1.0 release, thanks!