Cannot read property 'cleanupAnimation' of undefined

[jridgewell]

TypeError: Cannot read property 'cleanupAnimation' of undefined
    at e (https://cdn.ampproject.org/rtv/001812121952400/v0/amp-lightbox-gallery-0.1.js:77:223)
    at Sj.a.w.runPromise.mutate (https://cdn.ampproject.org/rtv/001812121952400/v0.js:330:185)
    at Rm (https://cdn.ampproject.org/rtv/001812121952400/v0.js:514:228)
    at Nm.f.rh (https://cdn.ampproject.org/rtv/001812121952400/v0.js:513:268)

[sparhami]

Fixed by #16