diff --git a/src/Interpreters/ActionsDAG.cpp b/src/Interpreters/ActionsDAG.cpp
index 4c3a4cbe0fa..e71c60bb540 100644
--- a/src/Interpreters/ActionsDAG.cpp
+++ b/src/Interpreters/ActionsDAG.cpp
@@ -821,6 +821,13 @@ ActionsDAGPtr ActionsDAG::merge(ActionsDAG && first, ActionsDAG && second)
 
     first.nodes.splice(first.nodes.end(), std::move(second.nodes));
 
+    /// Here we rebuild index because some string_view from the first map now may point to string from second.
+    ActionsDAG::Index first_index;
+    for (auto * node : first.index)
+        first_index.insert(node);
+
+    first.index.swap(first_index);
+
 #if USE_EMBEDDED_COMPILER
     if (first.compilation_cache == nullptr)
         first.compilation_cache = second.compilation_cache;
diff --git a/tests/queries/0_stateless/01672_actions_dag_merge_crash.reference b/tests/queries/0_stateless/01672_actions_dag_merge_crash.reference
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/queries/0_stateless/01672_actions_dag_merge_crash.sql b/tests/queries/0_stateless/01672_actions_dag_merge_crash.sql
new file mode 100644
index 00000000000..b3b5b3bcd91
--- /dev/null
+++ b/tests/queries/0_stateless/01672_actions_dag_merge_crash.sql
@@ -0,0 +1 @@
+SELECT [NULL, '25.6', '-0.02', NULL], [NULL], 1024, [NULL, '10485.76', NULL, NULL], [NULL, '-922337203.6854775808', toNullable(NULL)], [NULL] FROM (SELECT [multiIf((number % 1023) = -inf, toString(number), NULL)], NULL, '-1', multiIf((number % NULL) = NULL, toString(number), ''), [NULL, NULL], multiIf((number % NULL) = 65536, toString(number), '') AS s FROM system.numbers) LIMIT 1024 format Null