From 20327ab6934fbeb578d77b35418fa02eed57c914 Mon Sep 17 00:00:00 2001
From: Maciej Lech <maciej.lech@reef.pl>
Date: Thu, 25 Mar 2021 21:06:41 +0100
Subject: [PATCH] Add assertion in copy_part

---
 b2sdk/raw_api.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/b2sdk/raw_api.py b/b2sdk/raw_api.py
index 5de0a79d3..08afaeb2c 100644
--- a/b2sdk/raw_api.py
+++ b/b2sdk/raw_api.py
@@ -830,6 +830,7 @@ def copy_part(
             _add_range_header(range_dict, bytes_range)
             kwargs['range'] = range_dict['Range']
         if destination_server_side_encryption is not None:
+            assert destination_server_side_encryption.mode != EncryptionMode.SSE_B2
             kwargs['destinationServerSideEncryption'
                   ] = destination_server_side_encryption.as_value_dict()
         return self._post_json(