Caffeine - PubChem CID: 2519 error

./molecules/Structure2D_CID_2519.sdf TypeError: Cannot read property 'y' of undefined
    at HTMLUnknownElement.bondTransform (/home/ntr/code/sdftosvg/src/renderer.js:272:61)

the aromatic center of this molecule is set to null and has access attempted.
i don't know enough about chemistry to know what this represents but i can have a look for coding errors