diff --git a/lib/Interactor/Utility.js b/lib/Interactor/Utility.js
index b7537c5a..c64da7ef 100644
--- a/lib/Interactor/Utility.js
+++ b/lib/Interactor/Utility.js
@@ -100,11 +100,13 @@ StackTraceParser.prototype.parse = function (stack) {
 
   for (var i = 0, len = stack.length; i < len; i++) {
     var callsite = stack[i];
+    // avoid null values
+    if (!callsite.file_name || !callsite.line_number) continue;
     var type = (!path.isAbsolute(callsite.file_name) && callsite.file_name[0] !== '.') ? 'core' : 'user'
 
     // only use the callsite if its inside user space
     if (!callsite || type === 'core' || callsite.file_name.indexOf('node_modules') > -1 || callsite.file_name.indexOf('vxx') > -1)
-      continue ;
+      continue;
 
     // get the whole context (all lines) and cache them if necessary
     var context = self._cache.get(callsite.file_name)