From 2c269a39b9b3ba04e2d4d4cae82a0aa021d5f569 Mon Sep 17 00:00:00 2001
From: creslin <34645187+creslinux@users.noreply.github.com>
Date: Thu, 31 May 2018 11:47:33 +0300
Subject: [PATCH] Catch error condition when loading time range

---
 freqtrade/optimize/__init__.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/freqtrade/optimize/__init__.py b/freqtrade/optimize/__init__.py
index f6f1ba47a..f851ef112 100644
--- a/freqtrade/optimize/__init__.py
+++ b/freqtrade/optimize/__init__.py
@@ -74,6 +74,25 @@ def load_tickerdata_file(
             pairdata = json.load(tickerdata)
     else:
         return None
+    
+    """
+    Check if timerange is in the pairdata loaded
+    Return None is not, which will then download the file.
+    
+    This is to avoid trim_tickerlist throwing
+    "list index out of range" error else.
+    """
+    if timerange:
+        howmany = (len(pairdata) - 1)
+        first_file_timestamp = (pairdata[0][0])
+        last_file_timestamp =  (pairdata[howmany][0])
+        stype, start, stop = timerange
+        if stype[0] == 'date':
+            if first_file_timestamp > (start * 1000):
+                return None
+        if stype[1] == 'date':
+            if last_file_timestamp < (stop * 1000):
+                return None
 
     if timerange:
         pairdata = trim_tickerlist(pairdata, timerange)