diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index cb65fbf..84edfbb 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -729,3 +729,10 @@
   call search(getline("."))
   bwipe!
 endfunc
+
+func Test_search_sentence()
+  new
+  " this used to cause a crash
+  call assert_fails("/\\%'", 'E486')
+  call assert_fails("/", 'E486')
+endfunc