The following commits will have this bug very frequently. I suggest checking This one.
4061e4a

The following commit will have this bug less frequently.
d09c950

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To reproduce, simply open the map file and then click play in editor.

it will directly crash Because of an assertion.

The error is as follows,

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If you don't have a debugger attached and run the engine, Then the following windows will appeared When the assertion Has been reached. You can see the stack frame With the function name and line number, because I have installed the debugger symbols.

It is believed that the issue relates to Shader.