diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index c9261588c..6118ecc53 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -112,6 +112,10 @@ sub mount_chroot {
 
 sub umount_chroot {
     my $rootimage_dir = shift;
+    if ($rootimage_dir eq "") {
+        print "\n\n\n\nWARNING: /proc and /sys may still be mounted in the rootimgdir\n\n\n\n";
+        return 1;
+    }
 
     if (majversion($osver) > 6) {
         system("umount -l $rootimage_dir/proc");
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/genimage b/xCAT-server/share/xcat/netboot/ubuntu/genimage
index 5dbd8d482..1e9ccf0e8 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/genimage
+++ b/xCAT-server/share/xcat/netboot/ubuntu/genimage
@@ -2110,6 +2110,11 @@ sub mount_chroot {
 
 sub umount_chroot {
     my $rootimage_dir = shift;
+    if ($rootimage_dir eq "") {
+        print "\n\n\n\nWARNING: /proc and /sys may still be mounted in the rootimgdir\n\n\n\n";
+        return 1;
+    }
+
 
     system("umount -l $rootimage_dir/proc");
     system("umount -l $rootimage_dir/sys");