diff --git a/lua/wikis/commons/Standings/Table/Legacy/Next.lua b/lua/wikis/commons/Standings/Table/Legacy/Next.lua
index 22c6895ea23..6628f238175 100644
--- a/lua/wikis/commons/Standings/Table/Legacy/Next.lua
+++ b/lua/wikis/commons/Standings/Table/Legacy/Next.lua
@@ -60,6 +60,9 @@ local IMPLICIT_TIEBREAKERS = {
 function StandingTableLegacyNext.run(frame)
 	local args = Arguments.getArgs(frame)
 
+	assert(args.tiebreaker1 ~= 'finalTiebreak', 'This SwissTableLeague has to be converted'
+		.. ' manually due to using unsupported manual tiebreakers')
+
 	local matchRecords = StandingTableLegacyNext.fetchMatches(args)
 	local matchesByRound, roundCount = StandingTableLegacyNext.groupMatchesByRound(args, matchRecords)
 	local rounds = Table.map(Array.range(1, roundCount), function(roundIndex)