diff --git a/advtrains_interlocking/routesetting.lua b/advtrains_interlocking/routesetting.lua
index 7c4d14c..43679fd 100644
--- a/advtrains_interlocking/routesetting.lua
+++ b/advtrains_interlocking/routesetting.lua
@@ -45,6 +45,7 @@ ilrs.rte_callbacks = {
 -- false, message, cbts, cblk - something went wrong, what is contained in the message.
 -- cbts: the ts id of the conflicting ts, cblk: the pts of the conflicting component
 function ilrs.set_route(signal, route, try)
+	if not route then return end
 	if not try then
 		local tsuc, trsn, cbts, cblk = ilrs.set_route(signal, route, true)
 		if not tsuc then