From 32f0a629aac28010050826bbbc0a793d8e352f25 Mon Sep 17 00:00:00 2001
From: Stelios Petrakis <92467926+steliospetrakis02@users.noreply.github.com>
Date: Wed, 5 Apr 2023 14:38:49 +0300
Subject: [PATCH] Update merge.py

---
 pandas/core/reshape/merge.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/core/reshape/merge.py b/pandas/core/reshape/merge.py
index bfaf403491801..27fc0bacae953 100644
--- a/pandas/core/reshape/merge.py
+++ b/pandas/core/reshape/merge.py
@@ -2451,7 +2451,9 @@ def _convert_arrays_and_get_rizer_klass(
             #  expected type "Type[object]"
             klass = _factorizers[lk.dtype.type]  # type: ignore[index]
         else:
-            klass = _factorizers[lk.dtype.type]
+            klass = libhashtable.ObjectFactorizer
+            lk = ensure_object(lk)
+            rk = ensure_object(rk)
 
     else:
         klass = libhashtable.ObjectFactorizer