--- src/netcf.c.orig	2009-10-28 14:05:51.000000000 +0100
+++ src/netcf.c	2009-10-28 14:06:00.000000000 +0100
@@ -111,7 +111,8 @@ int ncf_close(struct netcf *ncf) {
 
     ERR_COND_BAIL(ncf->ref > 1, ncf, EINUSE);
 
-    drv_close(ncf);
+    if (ncf->driver != NULL)
+        drv_close(ncf);
     unref(ncf, netcf);
     return 0;
  error: