diff --git a/lib/SNMP/Info/IPv6.pm b/lib/SNMP/Info/IPv6.pm
index aa7fa2d0..5d7d0abf 100644
--- a/lib/SNMP/Info/IPv6.pm
+++ b/lib/SNMP/Info/IPv6.pm
@@ -363,7 +363,7 @@ sub ipv6_addr_prefixlength {
 
 sub ipv6_addr {
     my $info = shift;
-    my $return;
+    my $return = {};
     my $indexes = $info->ipv6_index();
     foreach my $row (keys %$indexes) {
         my @parts = split(/\./, $row);
@@ -378,7 +378,8 @@ sub ipv6_addr {
         if ($is_valid && $addrsize == 16) {
             $return->{$row} = join(':', unpack('(H4)*', pack('C*', @parts)));
         } else {
-            warn sprintf("%s: unable to decode table index to IPv6 address. Raw data is [%s].\n", &_my_sub_name, $row);
+            sprintf("%s: unable to decode table index to IPv6 address. Raw data is [%s].\n", &_my_sub_name, $row)
+              if $info->debug();
         }
     }
     return $return;