How to handle error for "If else statement"?

Hi all,

I'm adding a custom column where values are based on conditional statement.

= Table.AddColumn( #"Added Index", 
        "Custom", 
                 each 
                   if Text.Contains(#"Added Index"{[Index] - 1}[INPUT],"ABC")  then
                     "NEW TEXT"
                   else
                    [INPUT]
                )

The answer in new column is correct, but in first row appears "Error" below since is doing {[Index] -1} for first element

Expression.Error: The index cannot be negative.
Details:
    Value=[Table]
    Index=-1

I added a "try otherwise.." before the "if" and output still shows Error for first element. How to handle this error? Thanks