Sorry, i’m not good at scripts or coding languages, no clue how to read this crash log.
I downloaded the 79gb editor symbols for debugging when I posted this, if that is what you mean?
I found a node in the material that makes the material Instance, crash. I don’t know why.
It works fine when I edit it in the shader graph and it looks fine in editor/ingame.
But if I try to open the materials, material instance. Then it crashes Unreal and gives me a crash error.
This node marked in Red is the node making the program crash
And this is what it contains.
If I remove it, the material Instance works and Unreal does not crash. However, it completely breaks the look of the material. If I have it, material looks great but opening the Mat Instance crashes Unreal.
GetVisibleMaterialParametersFromExpression()
Seems to be at fault. But it should tell you what or why is at fault for
D:\build++UE5\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditorUtilities.cpp:629Review the source around that line to get ideas.
And rebuild from source.
What do you mean by this? Review the source around that line?
I’ve sadly no clue what it means 
I have Unreal Engine installed to a partitioned SSD, on the D: drive thats all.
No custom build I think.