diff --git a/datasources/kmb/query.go b/datasources/kmb/query.go
index 72948ec..96068c8 100644
--- a/datasources/kmb/query.go
+++ b/datasources/kmb/query.go
@@ -1,6 +1,7 @@
 package kmb
 
 import (
+	"fmt"
 	query "github.com/tgckpg/golifehk/query"
 	"log"
 	"strings"
@@ -42,6 +43,9 @@ func Query(q query.QueryMessage) query.IQueryResult {
 		}
 
 		qo, err = query.MatchNearest(*q.Location, &bList, qr.NearestRange, qr.FallbackNearest)
+	} else {
+		qr.Error = fmt.Errorf("unsupported message")
+		goto qrReturn
 	}
 
 	qo.Message = &q
diff --git a/datasources/mtr/bus/query.go b/datasources/mtr/bus/query.go
index 52e8b00..b5690d3 100644
--- a/datasources/mtr/bus/query.go
+++ b/datasources/mtr/bus/query.go
@@ -1,6 +1,7 @@
 package bus
 
 import (
+	"fmt"
 	"strings"
 
 	query "github.com/tgckpg/golifehk/query"
@@ -29,6 +30,9 @@ func Query(q query.QueryMessage) query.IQueryResult {
 		qBusStops, err = query.MatchKeys(strings.ToUpper(q.Text), busStops)
 	} else if q.Location != nil {
 		qBusStops, err = query.MatchNearest(*q.Location, busStops, qr.NearestRange, qr.FallbackNearest)
+	} else {
+		qr.Error = fmt.Errorf("unsupported message")
+		goto qrReturn
 	}
 
 	if err != nil {