diff --git a/tubetool/init.lua b/tubetool/init.lua
index bdabb86..b0c5270 100644
--- a/tubetool/init.lua
+++ b/tubetool/init.lua
@@ -29,6 +29,10 @@ local tool = metatool:register_tool('tubetool', {
 -- Create namespace containing tubetool common functions
 tool:ns({
 	pipeworks_tptube_api_check = function(player)
+		if type(pipeworks) ~= "table" then
+			minetest.chat_send_player(player:get_player_name(), 'Pipeworks mod not installed.')
+			return false
+        end
 		if not pipeworks.tptube or not pipeworks.tptube.get_db then
 			minetest.chat_send_player(
 				player:get_player_name(),