diff --git a/right/src/usb_interfaces/usb_interface_basic_keyboard.c b/right/src/usb_interfaces/usb_interface_basic_keyboard.c
index a8431f3..05c2d61 100644
--- a/right/src/usb_interfaces/usb_interface_basic_keyboard.c
+++ b/right/src/usb_interfaces/usb_interface_basic_keyboard.c
@@ -23,6 +23,9 @@ void ResetActiveUsbBasicKeyboardReport(void)
 
 usb_status_t UsbBasicKeyboardAction(void)
 {
+    if (!UsbCompositeDevice.attach)
+        return kStatus_USB_Error; // The device is not attached
+
     if (((usb_device_hid_struct_t *)UsbCompositeDevice.basicKeyboardHandle)->interruptInPipeBusy) {
         ((usb_device_hid_struct_t *)UsbCompositeDevice.basicKeyboardHandle)->interruptInPipeBusy = 0;
         return USB_DeviceCancel(((usb_device_hid_struct_t *)UsbCompositeDevice.basicKeyboardHandle)->handle,
diff --git a/right/src/usb_interfaces/usb_interface_generic_hid.c b/right/src/usb_interfaces/usb_interface_generic_hid.c
index 1fcfe51..38e0f05 100644
--- a/right/src/usb_interfaces/usb_interface_generic_hid.c
+++ b/right/src/usb_interfaces/usb_interface_generic_hid.c
@@ -7,6 +7,9 @@ uint8_t GenericHidOutBuffer[USB_GENERIC_HID_OUT_BUFFER_LENGTH];
 
 static usb_status_t UsbReceiveData(void)
 {
+    if (!UsbCompositeDevice.attach)
+        return kStatus_USB_Error; // The device is not attached
+
     return USB_DeviceHidRecv(UsbCompositeDevice.genericHidHandle,
                              USB_GENERIC_HID_ENDPOINT_OUT_INDEX,
                              GenericHidInBuffer,
diff --git a/right/src/usb_interfaces/usb_interface_media_keyboard.c b/right/src/usb_interfaces/usb_interface_media_keyboard.c
index b286f99..bd6eb04 100644
--- a/right/src/usb_interfaces/usb_interface_media_keyboard.c
+++ b/right/src/usb_interfaces/usb_interface_media_keyboard.c
@@ -21,6 +21,9 @@ void ResetActiveUsbMediaKeyboardReport(void)
 
 usb_status_t UsbMediaKeyboardAction(void)
 {
+    if (!UsbCompositeDevice.attach)
+        return kStatus_USB_Error; // The device is not attached
+
     if (((usb_device_hid_struct_t *)UsbCompositeDevice.mediaKeyboardHandle)->interruptInPipeBusy)
         return kStatus_USB_Busy; // The previous report has not been sent yet
 
diff --git a/right/src/usb_interfaces/usb_interface_mouse.c b/right/src/usb_interfaces/usb_interface_mouse.c
index 200899b..059b92d 100644
--- a/right/src/usb_interfaces/usb_interface_mouse.c
+++ b/right/src/usb_interfaces/usb_interface_mouse.c
@@ -21,6 +21,9 @@ void ResetActiveUsbMouseReport(void)
 
 usb_status_t usbMouseAction(void)
 {
+    if (!UsbCompositeDevice.attach)
+        return kStatus_USB_Error; // The device is not attached
+
     if (((usb_device_hid_struct_t *)UsbCompositeDevice.mouseHandle)->interruptInPipeBusy)
         return kStatus_USB_Busy; // The previous report has not been sent yet
 
diff --git a/right/src/usb_interfaces/usb_interface_system_keyboard.c b/right/src/usb_interfaces/usb_interface_system_keyboard.c
index fd19699..90788d6 100644
--- a/right/src/usb_interfaces/usb_interface_system_keyboard.c
+++ b/right/src/usb_interfaces/usb_interface_system_keyboard.c
@@ -21,6 +21,9 @@ void ResetActiveUsbSystemKeyboardReport(void)
 
 usb_status_t UsbSystemKeyboardAction(void)
 {
+    if (!UsbCompositeDevice.attach)
+        return kStatus_USB_Error; // The device is not attached
+
     if (((usb_device_hid_struct_t *)UsbCompositeDevice.systemKeyboardHandle)->interruptInPipeBusy)
         return kStatus_USB_Busy; // The previous report has not been sent yet