Loops are buggy in Acrobat... or is it just me?

I've had a few issues with loops while working in Acrobat. Is it just me?

My current issue is that when my loop is in the code for a button, the code after the loop doesn't work. When I comment it out it's just fine except I need the output from the loop.

Here is my loop:

I have 88 text fields pap1, pap2, pap3... pap88.

Often there is no input until "pap40", sometimes there is input in "pap1".

I want the first input value "papStart" and the last "papEnd" when I press the button.

var papStart =0,     papEnd = 0;

for (var papRow = 1; papRow < 88; papRow += 1) {    if (this.getField("pap" + papRow).value > 1){    var papValue = this.getField("pap" + papRow).value;        papEnd = papValue;        if (papStart === 0) {            papStart = papValue;        }    }
}

When I run this in the debugger I get this error:

TypeError: this.getField("pap" + papRow) is null
2:Console:Exec

Thank you for your help with this. It's driving me CRAZY. I've tried a few different things.