diff --git a/init.lua b/init.lua
index a21c913..cd69a0d 100644
--- a/init.lua
+++ b/init.lua
@@ -336,6 +336,9 @@ markers.get_marker_formspec = function(player, pos, error_msg)
 
          if(not( ((n-i) == opposite )
              or not(markers.positions[ name ][ n-i ] )
+	     or not( coords ) or not( coords[1]) or not( coords[2])
+	     or not(markers.positions[ name ] )
+	     or not(markers.positions[ name ][ n-i ] )
              or  ( markers.positions[ name ][ n-i ].x == coords[ 1 ].x
                and markers.positions[ name ][ n-i ].z == coords[ 2 ].z )
              or  ( markers.positions[ name ][ n-i ].x == coords[ 2 ].x
@@ -349,6 +352,9 @@ markers.get_marker_formspec = function(player, pos, error_msg)
       -- save data     
       meta:set_string( 'coords', minetest.serialize( coords ) );
    end
+   if( not( coords ) or #coords < 2 or not( coords[1] ) or not( coords[2] )) then
+      return formspec_info.."Error: The last 4 markers\nyou placed do not form\na rectangle.]";
+   end
 
    -- the coordinates are set; we may present an input form now
 
diff --git a/land_title_register.lua b/land_title_register.lua
index 9c456a4..4156acb 100644
--- a/land_title_register.lua
+++ b/land_title_register.lua
@@ -29,7 +29,7 @@ minetest.register_tool( "markers:land_title_register",
        local name = placer:get_player_name();
 
        -- the position is what we're actually looking for
-       local pos  = minetest.get_pointed_thing_position( pointed_thing, 0 ); --under );
+       local pos  = minetest.get_pointed_thing_position( pointed_thing, false ); -- not above
        
        if( not( pos ) or not( pos.x )) then
           minetest.chat_send_player( name, "Position not found.");
@@ -50,7 +50,7 @@ minetest.register_tool( "markers:land_title_register",
        end
        local name = placer:get_player_name();
 
-       local pos  = minetest.get_pointed_thing_position( pointed_thing, under );
+       local pos  = minetest.get_pointed_thing_position( pointed_thing, false ); -- not above
        
        if( not( pos ) or not( pos.x )) then
           minetest.chat_send_player( name, "Position not found.");