diff --git a/interface_mobs_api.lua b/interface_mobs_api.lua
index 36991c3..98fd80a 100644
--- a/interface_mobs_api.lua
+++ b/interface_mobs_api.lua
@@ -86,6 +86,7 @@ function yl_speak_up.do_mobs_on_rightclick(self, clicker)
     -- protect npc with mobs:protector
     if mobs:protect(self, clicker) then
 	if(self.yl_speak_up) then
+		local pos = self.object:get_pos()
 		minetest.log("action","[MOD] yl_speak_up "..
 			" NPC n_"..tostring(self.yl_speak_up.id)..
 			" named "..tostring(self.yl_speak_up.npc_name)..