diff --git a/src/blob.c b/src/blob.c
index 04319f8..2833c1a 100644
--- a/src/blob.c
+++ b/src/blob.c
@@ -526,6 +526,7 @@
     if (l == NULL)
 	return;
 
+    CHECK_LIST_MATERIALIZE(l);
     FOR_ALL_LIST_ITEMS(l, li)
     {
 	int		error;
diff --git a/src/testdir/test_blob.vim b/src/testdir/test_blob.vim
index 473886d..bd816af 100644
--- a/src/testdir/test_blob.vim
+++ b/src/testdir/test_blob.vim
@@ -675,7 +675,10 @@
   let b = range(16)->repeat(64)->list2blob()
   call assert_equal(1024, b->len())
   call assert_equal([4, 8, 15], [b[100], b[1000], b[1023]])
+
   call assert_equal(0z, list2blob(test_null_list()))
+  call assert_equal(0z00010203, list2blob(range(4)))
 endfunc
 
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 184b377..0aadf4b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3728,
+/**/
     3727,
 /**/
     3726,