diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index a726933..2cd9625 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -83,3 +83,10 @@
   call add(x, 'foo')
   call assert_equal(['foo'], y)
 endfunc
+
+func Test_loop_over_null_list()
+  let null_list = submatch(1, 1)
+  for i in null_list
+    call assert_true(0, 'should not get here')
+  endfor
+endfunc