diff --git a/index.js b/index.js
index 509d392..a70d0f0 100644
--- a/index.js
+++ b/index.js
@@ -8,7 +8,7 @@ function highlightQuery (query, errors) {
 
   query.split('\n').forEach(function (row, index) {
     var line = index + 1
-    var lineErrors = locations.filter(function (loc) { return loc.line === line })
+    var lineErrors = locations.filter(function (loc) { return loc && loc.line === line })
 
     queryHighlight += row + '\n'