Why does clicking outside of NavMesh bounds in a click-to-move project make player pawn attempt to move towards world origin?

Development World Creation
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I’m clicking in black area and here is hit result: http://i.imgur.com/eJmznTE.png It sends player pawn to 0,0,0.

I added a large plane at Z: -2000 (outside of NavMesh): http://i.imgur.com/Q4ZHjZg.jpg And clicking on this one seems to not cause character to move. However, I actually want character to move. Not to 0,0,0, but to edge of my platform in direction of click.