diff --git a/src/exec/src/server.rs b/src/exec/src/server.rs
index d8ac8767..45518e93 100644
--- a/src/exec/src/server.rs
+++ b/src/exec/src/server.rs
@@ -214,9 +214,7 @@ impl OcclumExec for OcclumExecImpl {
                     "process:{} finished, send signal to {}",
                     process_id, client_process_id
                 );
-
-                //TODO: fix me if the client has been killed
-                signal::kill(Pid::from_raw(client_process_id as i32), Signal::SIGUSR1).unwrap();
+                signal::kill(Pid::from_raw(client_process_id as i32), Signal::SIGUSR1).unwrap_or_default();
             });
 
             resp.finish(ExecCommResponse {