--- birthstones.old/tools.lua
+++ birthstones/tools.lua
@@ -82,7 +82,8 @@
 			{'', 'default:stick'}
 		}
 	})
-	if minetest.get_modpath("farming") then
+	if minetest.get_modpath("farming") and
+	    farming.register_hoe ~= nil then
 		farming.register_hoe("birthstones:hoe_" .. material, { -- formerly ":farming:hoe_" .. material
 			description = display_name .. " Hoe",
 			inventory_image = "birthstones_tool_" .. material .. "hoe.png",