OriginalPostID-236523
Discussion posts and replies are publicly visible
As far as I remember, If the user submits the form with EXTENDED ASCII CHARACTERS or NON-PRINTABLE CHARACTERS, Write to Data Store Entity node will throw this kind of error.
Consider using the clean function to remove the non-printable characters from user typed values.
FYI, We found that this error is not happening in Write to Data Store Entity but it is happening in Write to Multiple Data Store Entities.