diff --git a/tasks/mm0/src/file.c b/tasks/mm0/src/file.c
index 80aa5ef..0b8f0d5 100644
--- a/tasks/mm0/src/file.c
+++ b/tasks/mm0/src/file.c
@@ -528,6 +528,14 @@ int do_close(struct tcb *task, int fd)
 	if ((err = vfs_close(task->tid, fd)) < 0)
 		return err;
 
+	/*
+	 * If there was no IO on it, we may not know the file,
+	 * we simply return here. Since we notify VFS about the
+	 * close, it can tell us if the fd was open or not.
+	 */
+	if (!task->files->fd[fd].vmfile)
+		return 0;
+
 	/* Reduce file refcount etc. */
 	vm_file_put(task->files->fd[fd].vmfile);
 
diff --git a/tools/run-qemu-insight b/tools/run-qemu-insight
index c1dd66e..8fa2ddb 100755
--- a/tools/run-qemu-insight
+++ b/tools/run-qemu-insight
@@ -1,4 +1,4 @@
-cd build
+cd build/loader
 qemu-system-arm -s -kernel final.axf -nographic -m 128 -M versatilepb &
 arm-none-insight ; pkill qemu-system-arm
 cd ..