Index: generic/src/mm/as.c
===================================================================
--- generic/src/mm/as.c	(revision 5552d60c21fc8d5a719935adec188c854c60d858)
+++ generic/src/mm/as.c	(revision 4fded58aa3e9d077e85ec03f4c86b755c84c174a)
@@ -1058,4 +1058,9 @@
 	}
 
+	if (!leaf->keys) {
+		btree_insert(&a->used_space, page, (void *) count, leaf);
+		return 1;
+	}
+
 	node = btree_leaf_node_left_neighbour(&a->used_space, leaf);
 	if (node) {