diff --git a/lib/Mail/DMARC/PurePerl.pm b/lib/Mail/DMARC/PurePerl.pm
index b61eafaf..1372f788 100644
--- a/lib/Mail/DMARC/PurePerl.pm
+++ b/lib/Mail/DMARC/PurePerl.pm
@@ -297,6 +297,7 @@ sub is_whitelisted {
         foreach my $line ( split /\n/, $self->slurp($white_file) ) {
             next if $line =~ /^#/; # ignore comments
             my ($lip,$reason) = split /\s+/, $line, 2;
+            next if not defined $lip;
             $self->{_whitelist}{$lip} = $reason;
         };
     };