object keys are undefined in if conditional, but inside the if statement I can access it

As the title states, I have a variable which is a javascript object, i'm comparing it with another js object by stringifying them. The problem is that the variable is completely accessible without calling the keys, so if(JSON.stringify(response) == JSON.stringify(lastcmd)) works perfectly fine, but accessing lastcmd's id key will cause it to throw undefined.

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