diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 5fdd717..5704511 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1149,6 +1149,18 @@
       enddef
   END
   CheckScriptFailure(lines, 'E1160:')
+
+  lines =<< trim END
+      vim9script
+      def DoIt()
+        g:Later('')
+      enddef
+      defcompile
+      def g:Later(...l:  list<number>)
+      enddef
+      DoIt()
+  END
+  CheckScriptFailure(lines, 'E1013: Argument 1: type mismatch, expected number but got string')
 enddef
 
 let s:value = ''
diff --git a/src/version.c b/src/version.c
index 9d5ede5..867d894 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3308,
+/**/
     3307,
 /**/
     3306,
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 690b7e0..b728815 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -893,7 +893,7 @@
 
     if (ufunc != NULL)
     {
-	if (ufunc->uf_arg_types != NULL)
+	if (ufunc->uf_arg_types != NULL || ufunc->uf_va_type != NULL)
 	{
 	    int i;
 	    typval_T	*argv = STACK_TV_BOT(0) - argcount;
@@ -904,7 +904,7 @@
 	    {
 		type_T *type = NULL;
 
-		if (i < ufunc->uf_args.ga_len)
+		if (i < ufunc->uf_args.ga_len && ufunc->uf_arg_types != NULL)
 		    type = ufunc->uf_arg_types[i];
 		else if (ufunc->uf_va_type != NULL)
 		    type = ufunc->uf_va_type->tt_member;