From d26226ee3e51513ce3fc77af2f1aed3689946b47 Mon Sep 17 00:00:00 2001
From: samukweku <samueloranyeli@gmail.com>
Date: Sun, 12 Mar 2023 15:21:42 +1100
Subject: [PATCH] default 0 for nth

---
 src/core/expr/fexpr.cc     | 3 +--
 src/core/expr/fexpr_nth.cc | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/core/expr/fexpr.cc b/src/core/expr/fexpr.cc
index 8d5f95f46..8b6458c9b 100644
--- a/src/core/expr/fexpr.cc
+++ b/src/core/expr/fexpr.cc
@@ -533,8 +533,7 @@ DECLARE_METHOD(&PyFExpr::min)
 
 oobj PyFExpr::nth(const XArgs& args) {
   auto nthFn = oobj::import("datatable", "nth");
-  oobj n = args[0].to_oobj() ? args[0].to_oobj() 
-                             : py::oint(0);
+  auto n = args[1].to<py::oobj>(py::oint(0));
   oobj skipna = args[1].to_oobj_or_none();
   return nthFn.call({this, n, skipna});
 }
diff --git a/src/core/expr/fexpr_nth.cc b/src/core/expr/fexpr_nth.cc
index aecde185d..7f98fac34 100644
--- a/src/core/expr/fexpr_nth.cc
+++ b/src/core/expr/fexpr_nth.cc
@@ -110,7 +110,7 @@ class FExpr_Nth : public FExpr_Func {
 
 static py::oobj pyfn_nth(const py::XArgs& args) {
   auto arg = args[0].to_oobj();
-  auto n = args[1].to_oobj();
+  auto n = args[1].to<py::oobj>(py::oint(0));
   auto skipna = args[2].to<bool>(false);
   if (!n.is_int()) {
     throw TypeError() << "The argument for the `nth` parameter "