global: make sure to check service before checking service->port to prevent crashes

1 files changed, 3 insertions, 3 deletions

diff --git a/src/heartbeat.c b/src/heartbeat.c
index 0f8d2f3..cee852e 100644
--- a/src/heartbeat.c
+++ b/src/heartbeat.c
@@ -74,13 +74,13 @@ heartbeat_error_t heartbeat_client_new(idevice_t device, lockdownd_service_descr
 {
         *client = NULL;
 
-        debug_info("Creating heartbeat_client, port = %d.", service->port);
-
-        if (!device || service->port == 0 || !client || *client) {
+        if (!device || !service || service->port == 0 || !client || *client) {
                 debug_info("Incorrect parameter passed to heartbeat_client_new.");
                 return HEARTBEAT_E_INVALID_ARG;
         }
 
+        debug_info("Creating heartbeat_client, port = %d.", service->port);
+
         property_list_service_client_t plclient = NULL;
         heartbeat_error_t ret = heartbeat_error(property_list_service_client_new(device, service, &plclient));
         if (ret != HEARTBEAT_E_SUCCESS) {