VideoReader hangs when going out of scope

I have just started trying this library for loading videos and it has all the features I am looking for. Unfortunately, when I run a simple script to read some video the script doesn't exit and hangs. Here is the minimal example I run:

import decord
vr = decord.VideoReader('example_vid.mp4', width=128, height=128)
vid = vr.get_batch(range(50, 125))

I have checked and it seems to hang on the del function on the _CAPI_VideoReaderFree(self._handle) call.