This is to fix the Client set building type collapsed node causing a crash, disconnect the Event from the collapsed node and copy the image below.

Add the highlighted nodes shown in the image below, location at the top of the image.

Then save the blueprint, you can now try to highlight both the Client set building type collapsed node and the comment box around it at the same time and delete them using the delete key on your keyboard. If this crashes the engine you can try again, if it continues to crash when deleting just leave the Client set building type node disconnected.