diff -up nfs-utils-1.3.0/tools/nfs-iostat/nfs-iostat.py.orig nfs-utils-1.3.0/tools/nfs-iostat/nfs-iostat.py
--- nfs-utils-1.3.0/tools/nfs-iostat/nfs-iostat.py.orig	2017-11-03 09:29:39.000000000 -0400
+++ nfs-utils-1.3.0/tools/nfs-iostat/nfs-iostat.py	2017-11-03 09:34:25.000000000 -0400
@@ -434,6 +434,8 @@ def parse_stats_file(filename):
         words = line.split()
         if len(words) == 0:
             continue
+	if line.startswith("no device mounted") :
+            continue
         if words[0] == 'device':
             key = words[4]
             new = [ line.strip() ]