A little help with json_encode

I can use some help have a simple bug but figure out what to do.

I have echo json_encode($response);

which works fine unless the response is "0" and then I get an empty
"responseVars:"

If I do echo json_encode($response ->number);
I get responseVars: {"number":0} also incorrect it should just return
"0"

Any ideas what I'm doing wrong?

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