Game crash when going near structures

Game crashes going near certain structures if there is a custom advancement that detects it. Only tested with desert pyramids. Multiple crash reports in attachments.

To Reproduce:

1. make new world in 18w11a

2. create a datapack that has an advancement that is granted by going in a desert pyramid. My example in attachments

3. put it in the new world

4. use /reload

5. find desert pyramid

6. game crashes