diff --git a/src/kernel/exception.rs b/src/kernel/exception.rs
index de4defe..17599f2 100644
--- a/src/kernel/exception.rs
+++ b/src/kernel/exception.rs
@@ -67,9 +67,9 @@ fn syscall(machine: &mut Machine, system: &mut System) -> Result<MachineOk, Mach
         SC_EXIT => {
             let th = match &system.get_thread_manager().g_current_thread {
                 Some(th) => th,
-                None => Err("Current thread is None".into())
-            }?;
-            system.get_thread_manager().thread_finish(machine, th);
+                None => Err("Current thread is None")?
+            };
+            system.get_thread_manager().thread_finish(machine, *th);
             Ok(MachineOk::Ok)
         },
         SC_EXEC => todo!(),