I made a CPP measuring script and what should I add to my script to skip the unmeasurable files and keep the script running?

Question

I made CPP measuring script in Praat. If even one of the files is unmeasurable, the script will stop running. How do I change the code below to allow the praat to skip the unmeasurable files and leave the result blank, and keep the script running on the rest of the files?

form
    comment Directory of sound files 
    text sound_directory /Directory
    word soundfileExtension_(with_dot) .wav
    comment Full path of the resulting text file:
    text resultfile /Directory/x.txt
endform

fileappend 'resultfile$' fileName'tab$'syllable'tab$'cppValue'newline$'

Create Strings as file list... soundfileListObj 'sound_directory$'/*'soundfileExtension$'
numFiles = Get number of strings
pause 'numFiles' sound files identified. Continue?

for iFile to numFiles

    select Strings soundfileListObj
    soundName$ = Get string... iFile

    Read from file... 'sound_directory$'/'soundName$'
    Rename... soundObj

    #measuring CPP
    To Spectrum... yes
    To PowerCepstrum
    cppValue = Get peak prominence: 60, 333.3, "Parabolic", 0.001, 0.05, "Exponential decay", "Robust slow"

    fileappend "'resultfile$'" 'soundName$''tab$''cppValue''newline$'
    
    select all
    minus Strings soundfileListObj
    Remove

endfor


select all
Remove
#### END OF SCRIPT ####