diff --git a/darwin/grid.m b/darwin/grid.m
index 200c2a1b..aaf7a142 100644
--- a/darwin/grid.m
+++ b/darwin/grid.m
@@ -177,6 +177,8 @@ struct uiGrid {
 		if (ymax < (gc.top + gc.yspan))
 			ymax = gc.top + gc.yspan;
 	}
+	if (first == YES)		// the entire grid is hidden; do nothing
+		return;
 	xcount = xmax - xmin;
 	ycount = ymax - ymin;