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Error while processing event

I have an issue when sentry processes any event (next picture) in a BackboneJS project.

I capture exceptions this way:

* Function that will be invoked when there is an error with AJAX and 
* the it will be sent to the sentry server.
* @param  event
* @param  request
* @param  settings
$(document).ajaxError(function(event, request, settings, thrownError) {
	Sentry.captureException(thrownError  ||  request.statusText, {
		extra: { 
			type:  settings.type,
			url:  settings.url,
			status:  request.status,
			error:  thrownError  ||  request.statusText,
			response:  request.responseText.substring(0, 100)
* Function that will be invoked when there is an error
* @param  ex
function  captureError(ex) {
	Sentry.captureException(ex.message, {
		extra: {
			stack:  ex.stack,
			message:  ex.message

I’m usign a npm package : “@sentry/browser”: “^4.2.4”.

Looking for a solution, Chrome inspector lets me know that i had two 404 Not Found responses for /committers/ request.( Maybe, it could be the problem?)

Have you ever had this error? Did u know a solution, a workaround or even a clue where to start researching.