Using variables makes Godot crash

[PastaSugondese]

I attempted to make it so the second time you talk to an NPC different text appears compared to the second time. I tried to do this by working with an if condition and x variables. However, upon introducing either of the two I get this error:
Invalid get index 'value' (on base: 'Dictionary').
I don't really know how I am supposed to approach this. Any kind of help would be greatly appreciated.