diff --git a/extract/ExtBasic.c b/extract/ExtBasic.c
index 532d6e6a..61d6e63d 100644
--- a/extract/ExtBasic.c
+++ b/extract/ExtBasic.c
@@ -4017,6 +4017,10 @@ extNodeAreaFunc(tile, arg)
 	{
 	    TITORECT(tile, &r);
 	    GEOCLIP(&r, extNodeClipArea);
+
+	    /* Check if the tile is outside the clip area */
+	    if ((r.r_xtop <= r.r_xbot) || (r.r_ytop < r.r_ybot)) continue;
+
 	    area = (dlong)(r.r_xtop - r.r_xbot) * (dlong)(r.r_ytop - r.r_ybot);
 	}
 	else area = (dlong)(TOP(tile) - BOTTOM(tile)) * (dlong)(RIGHT(tile) - LEFT(tile));