diff --git a/perl-xCAT/xCAT/Table.pm b/perl-xCAT/xCAT/Table.pm
index 5557ebe7e..691c12841 100644
--- a/perl-xCAT/xCAT/Table.pm
+++ b/perl-xCAT/xCAT/Table.pm
@@ -2044,6 +2044,7 @@ sub getNodesAttribs {
         return dbc_call($self,'getNodesAttribs',@_);
     }
     my $nodelist = shift;
+    unless ($nodelist) { $nodelist = []; } #common to be invoked with undef seemingly
     my %options=();
     my @attribs;
     if (ref $_[0]) {
diff --git a/xCAT-server/lib/xcat/plugins/blade.pm b/xCAT-server/lib/xcat/plugins/blade.pm
index 95c1fe0b9..d15675ae2 100644
--- a/xCAT-server/lib/xcat/plugins/blade.pm
+++ b/xCAT-server/lib/xcat/plugins/blade.pm
@@ -3695,6 +3695,7 @@ sub filter_nodes{
 sub build_more_info{
   my $noderange=shift;
   my $callback=shift;
+  unless ($noderange) { return []; }
   my $mptab = xCAT::Table->new("mp");
   my @moreinfo=();
   unless ($mptab) {