By looking at our source code, I see what makes a bad programmer. I see "invalid data" in error logs, guess which of the following 3 conditions caused this:

function somefunc() {
if(condition_1) {
throw "invalid data"
}

if(condition_2) {
throw "invalid data"
}

if(condition_3) {
throw "invalid data"
}

return some_response;
}