1 files changed, 1 insertions, 1 deletions

diff --git a/src/usbmux.c b/src/usbmux.c
index 9fb75ef..4512dad 100644
--- a/src/usbmux.c
+++ b/src/usbmux.c
@@ -179,7 +179,7 @@ iphone_error_t iphone_mux_new_client(iphone_device_t device, uint16_t src_port,
 iphone_error_t iphone_mux_free_client(iphone_umux_client_t client)
 {
         if (!client || !client->phone)
-                return;
+                return IPHONE_E_INVALID_ARG;
 
         client->header->tcp_flags = 0x04;
         client->header->scnt = htonl(client->header->scnt);