updateByte gives error "Exceeded maximum number of writes"

[webnology-ch]

When setting:
const int maxAllowedWrites = 1;
and using the updateByte function I get the error: "Exceeded maximum number of writes".

this does NOT happen if:
const int maxAllowedWrites = 2;

if I use writeByte and
const int maxAllowedWrites = 1;
the error does not appear.