From 4b06c9e0aeb03bb2fcbf1c3dc260c09fccd95edb Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Tue, 22 Sep 2020 19:37:18 +0200
Subject: [PATCH 1/2] Add test verifying wrong behaviour

---
 tests/test_wallets.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tests/test_wallets.py b/tests/test_wallets.py
index 884470014..450dabc4d 100644
--- a/tests/test_wallets.py
+++ b/tests/test_wallets.py
@@ -19,12 +19,17 @@ def test_sync_wallet_at_boot(mocker, default_conf):
                 "used": 0.0,
                 "total": 0.260739
             },
+            "USDT": {
+                "free": 20,
+                "used": 20,
+                "total": 40
+            },
         })
     )
 
     freqtrade = get_patched_freqtradebot(mocker, default_conf)
 
-    assert len(freqtrade.wallets._wallets) == 2
+    assert len(freqtrade.wallets._wallets) == 3
     assert freqtrade.wallets._wallets['BNT'].free == 1.0
     assert freqtrade.wallets._wallets['BNT'].used == 2.0
     assert freqtrade.wallets._wallets['BNT'].total == 3.0
@@ -32,6 +37,7 @@ def test_sync_wallet_at_boot(mocker, default_conf):
     assert freqtrade.wallets._wallets['GAS'].used == 0.0
     assert freqtrade.wallets._wallets['GAS'].total == 0.260739
     assert freqtrade.wallets.get_free('BNT') == 1.0
+    assert 'USDT' in freqtrade.wallets._wallets
     assert freqtrade.wallets._last_wallet_refresh > 0
     mocker.patch.multiple(
         'freqtrade.exchange.Exchange',
@@ -51,6 +57,7 @@ def test_sync_wallet_at_boot(mocker, default_conf):
 
     freqtrade.wallets.update()
 
+    # USDT is missing from the 2nd result - so should not be in this either.
     assert len(freqtrade.wallets._wallets) == 2
     assert freqtrade.wallets._wallets['BNT'].free == 1.2
     assert freqtrade.wallets._wallets['BNT'].used == 1.9

From 6b46a35b19737009db78ca82c843a550a64a6243 Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Tue, 22 Sep 2020 19:37:31 +0200
Subject: [PATCH 2/2] Fix bug of balances not disappearing

---
 freqtrade/wallets.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/freqtrade/wallets.py b/freqtrade/wallets.py
index b913155bc..ac08f337c 100644
--- a/freqtrade/wallets.py
+++ b/freqtrade/wallets.py
@@ -2,6 +2,7 @@
 """ Wallet """
 
 import logging
+from copy import deepcopy
 from typing import Any, Dict, NamedTuple
 
 import arrow
@@ -93,6 +94,10 @@ class Wallets:
                 balances[currency].get('used', None),
                 balances[currency].get('total', None)
             )
+        # Remove currencies no longer in get_balances output
+        for currency in deepcopy(self._wallets):
+            if currency not in balances:
+                del self._wallets[currency]
 
     def update(self, require_update: bool = True) -> None:
         """