diff --git a/js/sheetsee.js b/js/sheetsee.js
index 08ef265..a9d9f6f 100644
--- a/js/sheetsee.js
+++ b/js/sheetsee.js
@@ -163,7 +163,7 @@ function getMin(data, column){
 function getMatches(data, filter, category) {
   var matches = []
   data.forEach(function (element) {
-    var projectType = element[category].toLowerCase()
+    var projectType = element[category].toString().toLowerCase()
     if (projectType === filter.toLowerCase()) matches.push(element)
   })
   return matches