Mixed Content (laravel)

I get the following error (on every page)

app.js:703 Mixed Content: The page at 'https://sitename.com/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://ift.tt/2gNm7Zf'. This content should also be served over HTTPS.

The site is build with Laravel. Is there anybody who knows how to fix this error?

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