Comment by Keavon

Ah yes, you made me realize we could check if the node graph isn't open and tell the user to report a bug in that situation, which must have arisen from a tool or other WYSIWYG aspect of the program causing a node graph error. But we wouldn't show it if it arose from the user just noodling around with the nodes. That's a good idea that'll be worth us implementing, thank you for the suggestion.