After some experimentation I changed the value in my "size" array from 42 to 49 (to match the number of characters in my SpriteFont+ Character set):
{""c2array"":true,""size"":[2,49,1],""data"":[[[8],[9],[11],[12],[13],[15],[16],[17],[19],[20],[21],[23],[24],[25],[26],[28],[29],[30],[31],[32],[33],[34],[35],[36],[37],[38],[39],[40],[41],[44],[45],[47],[48],[49],[51],[52],[54],[56],[58],[59],[60],[73],[48],[38],[32],[58],[58],[56],[56]],[[""Il!'""],[""i|""],[""j:""],["".""],["")""],["",(`""],["";""],[""]""],[""1[""],[""J\""""],[""t-""],[""r""],[""s?°""],[""f""],[""L*""],[""€""],[""Pk""],[""F""],[""hn""],[""Bceuvx""],[""Eapq6""],[""So28""],[""Rbdgy3/""],[""05""],[""z49<>""],[""T\\$""],[""Y+""],[""HUXZ~£""],[""DK7=""],[""_""],[""C#&""],[""m""],[""N""],[""V""],[""w""],[""AG""],[""@""],[""O""],[""Q""],[""M""],[""%""],[""W""],[""ä""],[""ö""],[""ü""],[""Ä""],[""Ö""],[""Ü""],[""ß""]]]}
This solved my problem.