diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 41a105e76e22b44121e817bd3ebafc0e8082dd7d..e6e42e1ba44cfea95e37606d7fd1a57c16b13606 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -4264,19 +4264,21 @@ static inline void mas_wr_extend_null(struct ma_wr_state *wr_mas)
 {
 	struct ma_state *mas = wr_mas->mas;
 
-	if (mas->last < wr_mas->end_piv && !wr_mas->slots[wr_mas->offset_end])
+	if (!wr_mas->slots[wr_mas->offset_end]) {
+		/* If this one is null, the next and prev are not */
 		mas->last = wr_mas->end_piv;
-
-	/* Check next slot(s) if we are overwriting the end */
-	if ((mas->last == wr_mas->end_piv) &&
-	    (wr_mas->node_end != wr_mas->offset_end) &&
-	    !wr_mas->slots[wr_mas->offset_end + 1]) {
-		wr_mas->offset_end++;
-		if (wr_mas->offset_end == wr_mas->node_end)
-			mas->last = mas->max;
-		else
-			mas->last = wr_mas->pivots[wr_mas->offset_end];
-		wr_mas->end_piv = mas->last;
+	} else {
+		/* Check next slot(s) if we are overwriting the end */
+		if ((mas->last == wr_mas->end_piv) &&
+		    (wr_mas->node_end != wr_mas->offset_end) &&
+		    !wr_mas->slots[wr_mas->offset_end + 1]) {
+			wr_mas->offset_end++;
+			if (wr_mas->offset_end == wr_mas->node_end)
+				mas->last = mas->max;
+			else
+				mas->last = wr_mas->pivots[wr_mas->offset_end];
+			wr_mas->end_piv = mas->last;
+		}
 	}
 
 	if (!wr_mas->content) {