diff --git a/servers/grpc/proto/helpers.go b/servers/grpc/proto/helpers.go
index c1e662a..2ffab50 100644
--- a/servers/grpc/proto/helpers.go
+++ b/servers/grpc/proto/helpers.go
@@ -200,10 +200,12 @@ func (b *CarpoolServiceBooking) ToOCSS() ocss.Booking {
 	}
 	if b.Price != nil {
 		pricetype := ocss.Unknown
-		if *b.Price.Type == CarpoolServicePriceType_FREE {
-			pricetype = ocss.Free
-		} else if *b.Price.Type == CarpoolServicePriceType_PAYING {
-			pricetype = ocss.Paying
+		if b.Price.Type != nil {
+			if *b.Price.Type == CarpoolServicePriceType_FREE {
+				pricetype = ocss.Free
+			} else if *b.Price.Type == CarpoolServicePriceType_PAYING {
+				pricetype = ocss.Paying
+			}
 		}
 		price = ocss.Price{
 			Type:     &pricetype,