SamSecretNG is defined in the file "script.rpy" on Line 243 and defaulted to False in my official version.
Are you using a Mod, Compressed version, or anything other than my own releases or the66's official Android version? If so, contact the creator and let them know they need to amend their script file.
If you want to quickly fix it yourself then add this line to the script beginning of your script where the other defaults are.
Python:
default SamSecretNG = False
You can edit this using any notepad processor, VSCodium, Notepad++ and Atom are all completely free to download and use.