WebGL "memory access out of bounds" on SetComponentData

Using Entities preview 30 on 2019.1.0f2. My webgl build always crashes on this line in my code
https://github.com/foolmoron/BabyBenjamins/blob/master/Assets/Scripts/ItemManager.cs#L160. Not sure why SetComponentData would have that problem. It works fine in the editor and in the Windows build.

Any ideas? Here's a dev build zip. The source code up there is also everything.
https://www.dropbox.com/s/gsxti34u5jgucj0/BabyBenjamins_webgl.zip?dl=0

 

No one has run into this before?

 

Also the option for WebGL memory size has gone away. Is there some other way to set that now?