From 471c04cb50ac24c9347d260fdfc5af28746b545f Mon Sep 17 00:00:00 2001
From: Guillaume Ballet <3272758+gballet@users.noreply.github.com>
Date: Tue, 14 Feb 2023 08:15:14 +0100
Subject: [PATCH] fix: stateless PoA stem insertion in TreeFromProof

---
 hashednode.go | 4 +++-
 stateless.go  | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/hashednode.go b/hashednode.go
index 3851197a..062bb577 100644
--- a/hashednode.go
+++ b/hashednode.go
@@ -30,6 +30,8 @@ import (
 	"fmt"
 )
 
+var ErrReadFromHashedNode = errors.New("can not read from a hash node")
+
 type HashedNode struct {
 	commitment  []byte
 	cachedPoint *Point
@@ -48,7 +50,7 @@ func (*HashedNode) Delete([]byte, NodeResolverFn) error {
 }
 
 func (*HashedNode) Get([]byte, NodeResolverFn) ([]byte, error) {
-	return nil, errors.New("can not read from a hash node")
+	return nil, ErrReadFromHashedNode
 }
 
 func (n *HashedNode) Commit() *Point {
diff --git a/stateless.go b/stateless.go
index d99fe873..29a78f4b 100644
--- a/stateless.go
+++ b/stateless.go
@@ -340,6 +340,9 @@ func (n *StatelessNode) insertStem(path []byte, stemInfo stemInfo, comms []*Poin
 			// nothing to do
 		case extStatusAbsentOther:
 			// insert poa stem
+			serialized := comms[0].Bytes()
+			n.children[path[0]] = &HashedNode{commitment: serialized[:], cachedPoint: comms[0]}
+			comms = comms[1:]
 		case extStatusPresent:
 			// insert stem
 			newchild := NewStatelessWithCommitment(comms[0])