Check the node below on globalstep, and if it's air just unmount (fixes #1)

cora, thanks again ^^

init.lua

@@ -34,19 +34,25 @@ minetest.register_globalstep(function(dtime)
 	for i=1, #players do
 		local name = players[i]:get_player_name()
 		if mcl_player.player_attached[name] and not players[i]:get_attach() and
-				(players[i]:get_player_control().up == true or
-				players[i]:get_player_control().down == true or
-				players[i]:get_player_control().left == true or
-				players[i]:get_player_control().right == true or
-				players[i]:get_player_control().jump == true or
-				players[i]:get_player_control().sneak == true) then
+			(players[i]:get_player_control().up == true or
+			players[i]:get_player_control().down == true or
+			players[i]:get_player_control().left == true or
+			players[i]:get_player_control().right == true or
+			players[i]:get_player_control().jump == true or
+			players[i]:get_player_control().sneak == true) then
+				players[i]:set_eye_offset({x=0, y=0, z=0}, {x=0, y=0, z=0})
+				players[i]:set_physics_override(1, 1, 1)
+				mcl_player.player_attached[name] = false
+				mcl_player.player_set_animation(players[i], "stand", 30)
+		end
+		-- check the node below player (and if it's air, just unmount)
+		if minetest.get_node(vector.offset(players[i]:get_pos(),0,-1,0)).name == "air" then
 			players[i]:set_eye_offset({x=0, y=0, z=0}, {x=0, y=0, z=0})
 			players[i]:set_physics_override(1, 1, 1)
 			mcl_player.player_attached[name] = false
-			mcl_player.player_set_animation(players[i], "stand", 30)
 		end
 	end
-end)
+end)	
 
 minetest.register_chatcommand("sit", {
 	description = S("Sit down"),