diff --git a/share/public/javascripts/portsort.js b/share/public/javascripts/portsort.js
index 2de54fc4..1a2d0c71 100644
--- a/share/public/javascripts/portsort.js
+++ b/share/public/javascripts/portsort.js
@@ -30,6 +30,8 @@ function portSort (a, b) {
         // octal regex
         ore = /^0/,
         // convert all to strings and trim()
+        if (typeof a == 'null') { a = ''; }
+        if (typeof b == 'null') { b = ''; }
         x = a.toString().replace(sre, '') || '',
         y = b.toString().replace(sre, '') || '';