diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index 8a53930..5358115 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -464,6 +464,9 @@ inline void Node256::copyChildrenAndKeyFrom(const Node48 &other) {
 inline void Node256::copyChildrenAndKeyFrom(const Node256 &other) {
   memcpy((char *)this + kNodeCopyBegin, (char *)&other + kNodeCopyBegin,
          kNodeCopySize);
+  for (int i = 0; i < 256; ++i) {
+    children[i].child = nullptr;
+  }
   bitSet = other.bitSet;
   bitSet.forEachInRange(
       [&](int c) {