diff --git a/luci-app-mptcp/luasrc/controller/mptcp.lua b/luci-app-mptcp/luasrc/controller/mptcp.lua
index 7dcdba960..f4a9002d4 100644
--- a/luci-app-mptcp/luasrc/controller/mptcp.lua
+++ b/luci-app-mptcp/luasrc/controller/mptcp.lua
@@ -33,7 +33,7 @@ function multipath_bandwidth()
 	local uci = luci.model.uci.cursor()
 
 	uci:foreach("network", "interface", function(s)
-		local dev = s["ifname"]
+		local dev = s["ifname"] or ""
 		if dev ~= "lo" and dev ~= "" then
 			local multipath = s["multipath"] or "off"
 			if multipath == "on" or multipath == "master" or multipath == "backup" or multipath == "handover" then