From ffd9baac83292c2d914f5616ec104e0f7dc4ed27 Mon Sep 17 00:00:00 2001
From: 4tochka <admin@bitaps.com>
Date: Tue, 7 May 2019 18:16:37 +0400
Subject: [PATCH] connector

---
 pybtc/connector/connector.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/pybtc/connector/connector.py b/pybtc/connector/connector.py
index d578560..ac3f37c 100644
--- a/pybtc/connector/connector.py
+++ b/pybtc/connector/connector.py
@@ -393,11 +393,12 @@ class Connector:
                                       "cache size %s M;" % (self.non_cached_blocks,
                                                             self.block_preload.len(),
                                                             round(self.block_preload._store_size / 1024 / 1024, 2)))
-                        self.log.info(
-                                      "cache first %s; "
-                                      "cache last %s;" % (
-                                                            next(iter(self.block_preload._store)),
-                                                            next(reversed(self.block_preload._store))))
+                        if self.block_preload._store:
+                            self.log.info(
+                                          "cache first %s; "
+                                          "cache last %s;" % (
+                                                                next(iter(self.block_preload._store)),
+                                                                next(reversed(self.block_preload._store))))
 
                         self.log.info("saved utxo block %s; "
                                       "saved utxo %s; "