diff --git a/src/fd/mod.rs b/src/fd/mod.rs
index f5900a7cda..342a166f66 100644
--- a/src/fd/mod.rs
+++ b/src/fd/mod.rs
@@ -380,19 +380,29 @@ pub(crate) fn poll(fds: &mut [PollFd], timeout: i32) -> Result<(), IoError> {
 	}
 }
 
+#[inline]
+async fn async_get_object(fd: FileDescriptor) -> Result<Arc<dyn ObjectInterface>, IoError> {
+	Ok((*(OBJECT_MAP.read().await.get(&fd).ok_or(IoError::EINVAL)?)).clone())
+}
+
 pub(crate) fn get_object(fd: FileDescriptor) -> Result<Arc<dyn ObjectInterface>, IoError> {
 	block_on(async_get_object(fd), None)
 }
 
-async fn async_get_object(fd: FileDescriptor) -> Result<Arc<dyn ObjectInterface>, IoError> {
-	Ok((*(OBJECT_MAP.read().await.get(&fd).ok_or(IoError::EINVAL)?)).clone())
+#[inline]
+async fn async_insert_object(
+	fd: FileDescriptor,
+	obj: Arc<dyn ObjectInterface>,
+) -> Result<(), IoError> {
+	let _ = OBJECT_MAP.write().await.insert(fd, obj);
+	Ok(())
 }
 
 pub(crate) fn insert_object(
 	fd: FileDescriptor,
 	obj: Arc<dyn ObjectInterface>,
-) -> Option<Arc<dyn ObjectInterface>> {
-	block_on(async { Ok(OBJECT_MAP.write().await.insert(fd, obj)) }, None).unwrap()
+) -> Result<(), IoError> {
+	block_on(async_insert_object(fd, obj), None)
 }
 
 // The dup system call allocates a new file descriptor that refers
diff --git a/src/lib.rs b/src/lib.rs
index 2d5de36e6c..9d388fac70 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -283,7 +283,7 @@ extern "C" fn initd(_arg: usize) {
 	riscv64::kernel::init_drivers();
 
 	syscalls::init();
-	fd::init().unwrap();
+	fd::init().expect("Unable to initialized standard file descriptors");
 	fs::init();
 
 	// Get the application arguments and environment variables.
diff --git a/src/syscalls/net.rs b/src/syscalls/net.rs
index 3d90bc9856..03789f9f85 100644
--- a/src/syscalls/net.rs
+++ b/src/syscalls/net.rs
@@ -270,7 +270,7 @@ extern "C" fn __sys_socket(domain: i32, type_: i32, protocol: i32) -> i32 {
 				drop(guard);
 				let socket = udp::Socket::new(handle);
 
-				insert_object(fd, Arc::new(socket));
+				insert_object(fd, Arc::new(socket)).expect("FD is already used");
 
 				return fd;
 			}
@@ -281,7 +281,7 @@ extern "C" fn __sys_socket(domain: i32, type_: i32, protocol: i32) -> i32 {
 				drop(guard);
 				let socket = tcp::Socket::new(handle);
 
-				insert_object(fd, Arc::new(socket));
+				insert_object(fd, Arc::new(socket)).expect("FD is already used");
 
 				return fd;
 			}
@@ -302,9 +302,9 @@ extern "C" fn __sys_accept(fd: i32, addr: *mut sockaddr, addrlen: *mut socklen_t
 				|e| -num::ToPrimitive::to_i32(&e).unwrap(),
 				|endpoint| {
 					let new_obj = dyn_clone::clone_box(&*v);
-					insert_object(fd, Arc::from(new_obj));
+					insert_object(fd, Arc::from(new_obj)).expect("FD is already used");
 					let new_fd = FD_COUNTER.fetch_add(1, Ordering::SeqCst);
-					insert_object(new_fd, v.clone());
+					insert_object(new_fd, v.clone()).expect("FD is already used");
 
 					if !addr.is_null() && !addrlen.is_null() {
 						let addrlen = unsafe { &mut *addrlen };