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One Page Checkout: Last step only sometimes works

One Page Checkout: Last step only sometimes works

Hey everyone,

I have the following problem:

Going from Step 3 to 4 during checkout it sometimes works fine and sometimes it changes to Step 4 but the loading animation won't disappear.

It throws the following exception:

Uncaught ReferenceError: _isChanged is not defined
    at Object.<anonymous> (VM50820 opcheckout.js:117)
    at c (VM50658 jquery-1.10.2.min.js:4)
    at Object.fireWith [as resolveWith] (VM50658 jquery-1.10.2.min.js:4)
    at k (VM50658 jquery-1.10.2.min.js:6)
    at XMLHttpRequest.r (VM50658 jquery-1.10.2.min.js:6)

I don't understand why it sometimes works and sometimes not. :/

Haven't really worked with Magento before.

 

The Magento version is 1.9.2.2

 

Thank you!