2 files changed, 4 insertions, 1 deletions
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index b0f7aefc7b..007b16568f 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -2630,7 +2630,7 @@ static int may_call_simple_func(const char *arg, typval_T *rettv)
   if (parens != NULL && *skipwhite(parens + 2) == NUL) {
     if (strnequal(arg, "v:lua.", 6)) {
       const char *p = arg + 6;
-      if (skip_luafunc_name(p) == parens) {
+      if (p != parens && skip_luafunc_name(p) == parens) {
         r = call_simple_luafunc(p, (size_t)(parens - p), rettv);
       }
     } else {
diff --git a/src/nvim/eval/userfunc.c b/src/nvim/eval/userfunc.c
index f7ce5334f0..d2bae72531 100644
--- a/src/nvim/eval/userfunc.c
+++ b/src/nvim/eval/userfunc.c
@@ -1779,6 +1779,9 @@ theend:
 int call_simple_luafunc(const char *funcname, size_t len, typval_T *rettv)
   FUNC_ATTR_NONNULL_ALL
 {
+  rettv->v_type = VAR_NUMBER;  // default rettv is number zero
+  rettv->vval.v_number = 0;
+
   typval_T argvars[1];
   argvars[0].v_type = VAR_UNKNOWN;
   nlua_typval_call(funcname, len, argvars, 0, rettv);