level dat corrupts when trying to get invuneribilaty

Put the summary of the bug you're having here

What I expected to happen was...:
it shouldn't corrupt instead it should've gave me invunibilyty

What actually happened was...:
the level.dat corrupted

Steps to Reproduce:
1. go to the world file
2. get a nbt explorer
3. open level.dat

4. go to player

5. update invulnerability from 0 to 1