If a function takes a parameter but none is provided the Parser will stall forever.

[transmissions11]

@FUNC@ <fetchJSON> [@url] {
  @VAR@ request = @RUN@ (requests/get,@url)
  @VAR@ json = @RUN@ (@request.json)
  @RETURN@ 
}

@VAR@ x = @RUN@ (<fetchJSON>)
@RUN@ (/print,None)

This code causes the parser to just never print or throw any errors, it just waits.

[transmissions11]

Oh nevermind this is due to trying to fetch "None"