Map not loading in multiplayer(crash)

Hi, i’m currently working on a multiplayer game with a friend, We can join in the lobby but a soon as we load the main map, this crash occure :confused:

My “M_Landscape_material” seems to be the problem cause if replace it, everything work fine (but the map is uggly…)

I don’t understand because everything works fine in the editor, there is no error or anything and the material is pretty simple (only 116 instructions using VertexNormal Mask to alternate between grass/Mud and cliff )

And the error only occure in multiplayer

Any ideas ?
my friend use this in the blueprint to travel in the map :
Command: ServerTravel map

may be it’s too fast and it doesn’t have time to load the material ?

any help or ideas would be appreciate :slight_smile: