Fixed a bug in AbstractMemory
Fixed a bug in AbstractMemory

It didn't raise a ruby level IndexError when it should have (offset to big).

babelsberg/babelsberg-r,topazproject/topaz,topazproject/topaz,topazproject/topaz,babelsberg/babelsberg-r,topazproject/topaz,babelsberg/babelsberg-r,babelsberg/babelsberg-r,babelsberg/babelsberg-r