diff --git a/modules/rhizo_base/files/collectd-hack b/modules/rhizo_base/files/collectd-hack
index a143b38..09ccaa9 100644
--- a/modules/rhizo_base/files/collectd-hack
+++ b/modules/rhizo_base/files/collectd-hack
@@ -6,7 +6,7 @@ is_empty () {
     echo "Error. exiting."
     exit
   fi
-  if  [ "$_o" == "0.0000000000e+00" ] ;then
+  if  [ "$_o" == "0.0000000000e+00" -o "$_o" == "NaN" ] ;then
     echo "$1 is empty"
     return 1
   fi