diff --git a/plugins/spamassassin b/plugins/spamassassin
index 5b62153..5ca7e76 100644
--- a/plugins/spamassassin
+++ b/plugins/spamassassin
@@ -102,7 +102,8 @@ sub hook_data_post { # check_spam
 
   my $remote  = 'localhost';
   my $port    = 783;
-  if ($self->{_args}->{spamd_socket} =~ /^([\w.-]+):(\d+)$/) {
+  if (defined $self->{_args}->{spamd_socket}
+      && $self->{_args}->{spamd_socket} =~ /^([\w.-]+):(\d+)$/) {
     $remote  = $1;
     $port    = $2;
   }