crash-2019-03-02_21.47.50-client.txt
crash-2019-03-02_21.49.06-client.txt
crash-2019-03-02_21.46.24-client.txt

Crashed when I died in water

https://github.com/Vazkii/Quark/blob/c09dab8115888e4c11f852a4257081e18636105f/src/main/java/vazkii/quark/oddities/entity/EntityTotemOfHolding.java#L193

This can be null clientside, and NBT does not allow null strings. replacing owner with owner == null ? "" : owner would solve it.