diff --git a/Info/Layer3/Aironet.pm b/Info/Layer3/Aironet.pm
index 6800fea3..72098703 100644
--- a/Info/Layer3/Aironet.pm
+++ b/Info/Layer3/Aironet.pm
@@ -90,7 +90,7 @@ sub os {
 
 sub os_ver {
     my $aironet = shift;
-    my $descr = $aironet->description();
+    my $descr = $aironet->description() || '';
 
     # CAP340 11.21, AP4800-E 11.21
     if ($descr =~ /AP\d{3,4}(-\D+)?\s+(\d{2}\.\d{2})/){