Index: uspace/drv/usbhid/mouse/mousedev.c
===================================================================
--- uspace/drv/usbhid/mouse/mousedev.c	(revision 56f8a04e9aa9e71b0207654a6a33d8650333226f)
+++ uspace/drv/usbhid/mouse/mousedev.c	(revision caed78437b6b0f28267288bb60dc9410e856aaf5)
@@ -157,10 +157,10 @@
 static void usb_mouse_free(usb_mouse_t **mouse_dev)
 {
-	if (mouse_dev == NULL || *mouse_dev == NULL) {
-		return;
-	}
+	assert(mouse_dev != NULL && *mouse_dev != NULL);
 	
 	// hangup phone to the console
-	async_hangup((*mouse_dev)->console_phone);
+	if ((*mouse_dev)->console_phone >= 0) {
+		async_hangup((*mouse_dev)->console_phone);
+	}
 	
 	free(*mouse_dev);