While condition not taking values

Hello, I have a weird problem where my while condition keeps saying that it cannot read the property I'm putting as a condition. The property I put a condition on is taken automatically with an http request node. Here are screenshots of my function and of the error:


What I don't understand is why if I just replace the while function with an if function the code works just fine but the while cannot read the property

Show us the code that use with if that works correctly.

[Edit] I presume you realise that while will repeatedly run the shift code until the test fails (or you get the error).

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