message: bug: Check if stack is available before reading url for ignoreUrl
diff: @@ -453,7 +453,7 @@ Raven.prototype = {
  // stack[0] is `throw new Error(msg)` call itself, we are interested in the frame that was just before that, stack[1]
  var initialCall = stack.stack[1];
  - var fileurl = initialCall.url || '';
  + var fileurl = (initialCall && initialCall.url) || '';
  if (
  !!this._globalOptions.ignoreUrls.test &&
  