Game crashes when live testing? w/ Picture

Only happen in the area. Something with the shader but no idea what it is. Anybody experienced this ?

Soo what i did to fix it: Delete the entire area and add it again.

I have no idea what happend to the chunck but somehow it is there but its not? Its showing but i cant change anything on the chunck so I just deleted it and added it again and rebuild it.

Is that thing referencing the WorldGridMaterial? Isn’t that the blank grey square texture?