Input() may crash on umlauts

[spikey]

No high prio.
Assumption: the backspace button deletes characters by byte not by character.
Reproduction:
1.) create this program:

a = input("Umlaut test")

2.) run it
3.) type ä
4.) press backspace (a char appears, with the byte code 192, shown as À)
5.) now type ä again
6.) message "The software was closed because an error occurred." appears