diff --git a/src/box/memtx_hash.cc b/src/box/memtx_hash.cc
index 72e2b40afda7ea9396f11e1a17beea6ae43695ac..a868a53a14f600902b6d12668fbd9af928dc37c7 100644
--- a/src/box/memtx_hash.cc
+++ b/src/box/memtx_hash.cc
@@ -546,6 +546,12 @@ hash_read_view_iterator_start(struct hash_read_view_iterator *it,
 	return 0;
 }
 
+static void
+hash_read_view_reset_key_def(struct hash_read_view *rv)
+{
+	rv->view.common.arg = NULL;
+}
+
 #endif /* !defined(ENABLE_READ_VIEW) */
 
 /** Implementation of create_iterator index_read_view callback. */
@@ -588,6 +594,7 @@ memtx_hash_index_create_read_view(struct index *base)
 	rv->index = index;
 	index_ref(base);
 	light_index_view_create(&rv->view, &index->hash_table);
+	hash_read_view_reset_key_def(rv);
 	return (struct index_read_view *)rv;
 }
 
diff --git a/src/box/memtx_tree.cc b/src/box/memtx_tree.cc
index fc32c8e6d3f4c9424388a742e729220216678d63..a58b9d864a2382320c32dbe1f77e943e9b44ae64 100644
--- a/src/box/memtx_tree.cc
+++ b/src/box/memtx_tree.cc
@@ -1762,6 +1762,13 @@ tree_read_view_iterator_start(struct tree_read_view_iterator<USE_HINT> *it,
 	return 0;
 }
 
+template <bool USE_HINT>
+static void
+tree_read_view_reset_key_def(struct tree_read_view<USE_HINT> *rv)
+{
+	rv->tree_view.common.arg = NULL;
+}
+
 #endif /* !defined(ENABLE_READ_VIEW) */
 
 /** Implementation of create_iterator index_read_view callback. */
@@ -1813,6 +1820,7 @@ memtx_tree_index_create_read_view(struct index *base)
 	rv->index = index;
 	index_ref(base);
 	memtx_tree_view_create(&rv->tree_view, &index->tree);
+	tree_read_view_reset_key_def(rv);
 	return (struct index_read_view *)rv;
 }