diff --git a/PVE/Diskmanage.pm b/PVE/Diskmanage.pm
index 612bc3b..55df3f2 100644
--- a/PVE/Diskmanage.pm
+++ b/PVE/Diskmanage.pm
@@ -152,6 +152,8 @@ sub get_smart_data {
 sub get_zfs_devices {
     my $list = {};
 
+    return {} if !(-x $ZPOOL);
+
     # use zpool and parttype uuid,
     # because log and cache do not have
     # zfs type uuid