Hello again.
I have updated the recipe list extension to correct the crash problem when entering the menu with only one crafting category. The way the plugin was designed, it was closing the category selection window immediately after creating it, if only one category existed, but the function to close the window was expecting some other windows to have already been created, which they weren't at that point. I adjusted it to create those windows before the category selection window, so it would be able to do it's thing with them.
Redownload the plugin from the store page to get this update.
-Ramza