diff --git a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
index 2ddbf24b3..9a5ba3e6d 100644
--- a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
+++ b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
@@ -531,12 +531,14 @@ end
 			    iffind=0
 			    iftty = luci.sys.exec("/usr/bin/mmcli -L")
 			    for listtty in iftty:gmatch("([^\r\n]*)[\r\n]") do
-				modemid = luci.sys.exec("echo '" .. listtty .. "' | awk -F' ' '{print $1}' | awk -F/ '{print $6}'")
-				modeminfo = luci.sys.exec("/usr/bin/mmcli -m " .. modemid .. " --output-keyvalue")
-				tty = luci.sys.exec("echo '" .. modeminfo .. "' | grep 'modem.generic.device ' | awk -F': ' '{print $2}'")
+				modemid = luci.util.trim(luci.sys.exec("echo '" .. listtty .. "' | awk -F' ' '{print $1}' | awk -F/ '{print $6}'"))
+				if modemid ~= '' then
+				    modeminfo = luci.sys.exec("/usr/bin/mmcli -m " .. modemid .. " --output-keyvalue")
+				    tty = luci.util.trim(luci.sys.exec("echo '" .. modeminfo .. "' | grep 'modem.generic.device ' | awk -F': ' '{print $2}'"))
 			%>
 			<option value="<%=tty%>"<% if uci:get("network",ifname,"device") == tty then iffind = 1 %> selected="selected"<% end %>><%=tty%></option>
 			<%
+				end
 			    end
 			    if iffinf == 0 and uci:get("network",ifname,"device") ~= nil then
 			%>