Echoing what others have already said ---
We have seen this usually with a German "sharp S" ---- let me see if I can cut and paste one in here:
What is sharp S in German?
Image result for german sharp s
In German orthography, the letter ß, called Eszett (IPA: [ɛsˈtsɛt] ess-TSET) or scharfes S (IPA: [ˌʃaʁfəs ˈʔɛs], lit. "sharp S"),
When loading it'll often get converted to "ss" or one extra character. If the field is defined as length 10, and the sharp s makes it go to 11, then boom!
Ed