Method FTFace::KernAdvance fails when index1 or index2 is equal or greater than 128 and kerning was precomputed. Precomputed values stored in an array 128*128, so we have out of bounds exception.
I think, it's needed to check this bounds.
.diff and the updated file
Logged In: YES
Your fix was actually already in FTGL. You must have grabbed an out-of-date file from
another project. Thanks!