Debug custom indicator (out of array)

Hello, i need a skilled coder that debugs an indicator (very short piece of code) whereby the error message contains the following: error out of range.
It appears on some timeframes on some pairs. So not every timeframe or pairs gets that error.
The error points to a calculation. I know it isn't a hard job but i need it done with professionalism and check if the code is up to date. If not, make it up to date so the code will run fast and smooth.
When interested, i will send all the details. I need you to deliver the full source back to me, without any added copyrights and limits. The code may not be shared or distributed as well.