From 1e7826f3922748449554d01cfb81c7c366c5babb Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Wed, 10 Jun 2020 19:57:59 +0200
Subject: [PATCH] Explicitly raise OperationalException if markets are not
 loaded correctly

---
 freqtrade/pairlist/IPairList.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/freqtrade/pairlist/IPairList.py b/freqtrade/pairlist/IPairList.py
index f48a7dcfd..fd25e0766 100644
--- a/freqtrade/pairlist/IPairList.py
+++ b/freqtrade/pairlist/IPairList.py
@@ -150,6 +150,9 @@ class IPairList(ABC):
         black_listed
         """
         markets = self._exchange.markets
+        if not markets:
+            raise OperationalException(
+                    'Markets not loaded. Make sure that exchange is initialized correctly.')
 
         sanitized_whitelist: List[str] = []
         for pair in pairlist: