diff --git a/src/nvim/indent.c b/src/nvim/indent.c
index 010d2fe869..d71b3adb5c 100644
--- a/src/nvim/indent.c
+++ b/src/nvim/indent.c
@@ -697,8 +697,10 @@ int get_lisp_indent(void)
             && lisp_match(that + 1)) {
           amount += 2;
         } else {
-          that++;
-          amount++;
+          if (*that != NUL) {
+            that++;
+            amount++;
+          }
           firsttry = amount;
 
           while (ascii_iswhite(*that)) {
diff --git a/src/nvim/testdir/test_lispwords.vim b/src/nvim/testdir/test_lispwords.vim
index ff710b2716..4144fb0521 100644
--- a/src/nvim/testdir/test_lispwords.vim
+++ b/src/nvim/testdir/test_lispwords.vim
@@ -1,4 +1,5 @@
-" Tests for 'lispwords' settings being global-local
+" Tests for 'lispwords' settings being global-local.
+" And  other lisp indent stuff.
 
 set nocompatible viminfo+=nviminfo
 
@@ -85,4 +86,13 @@ func Test_lisp_indent()
   set nolisp
 endfunc
 
+func Test_lisp_indent_works()
+  " This was reading beyond the end of the line
+  new
+  exe "norm a\tü(\<CR>="
+  set lisp
+  norm ==
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab