--- bt_delete.c.master	2017-06-28 19:06:46.002137000 +0200
+++ bt_delete.c	2017-06-28 16:57:12.001432000 +0200
@@ -313,6 +313,7 @@
 	 */
 	redo = 0;
 	h = e->page;
+	if (e->index < NEXTINDEX(h))
 	do {
 		if (__bt_dleaf(t, key, h, e->index)) {
 			mpool_put(t->bt_mp, h, 0);