From 9110c0542c40e00604a3d86eaf71e1646a9365d4 Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Mon, 19 Feb 2018 14:16:11 +0100
Subject: [PATCH] follow-up previous commit

---
 gui/qt/history_list.py | 15 +++++++++++----
 lib/wallet.py          |  3 +++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/gui/qt/history_list.py b/gui/qt/history_list.py
index cfe412db9..49a01f9b4 100644
--- a/gui/qt/history_list.py
+++ b/gui/qt/history_list.py
@@ -163,10 +163,14 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
         d.setMinimumSize(600, 150)
         vbox = QVBoxLayout()
         grid = QGridLayout()
+        start_date = h.get('start_date')
+        end_date = h.get('end_date')
+        if start_date is None and end_date is None:
+            return
         grid.addWidget(QLabel(_("Start")), 0, 0)
-        grid.addWidget(QLabel(h.get('start_date').isoformat(' ')), 0, 1)
+        grid.addWidget(QLabel(start_date.isoformat(' ')), 0, 1)
         grid.addWidget(QLabel(_("End")), 1, 0)
-        grid.addWidget(QLabel(h.get('end_date').isoformat(' ')), 1, 1)
+        grid.addWidget(QLabel(end_date.isoformat(' ')), 1, 1)
         grid.addWidget(QLabel(_("Initial balance")), 2, 0)
         grid.addWidget(QLabel(format_amount(h['start_balance'].value)), 2, 1)
         grid.addWidget(QLabel(str(h.get('start_fiat_balance'))), 2, 2)
@@ -199,8 +203,11 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
         self.transactions = r['transactions']
         self.summary = r['summary']
         if not self.years and self.start_timestamp is None and self.end_timestamp is None:
-            self.years = [str(i) for i in range(self.summary['start_date'].year, self.summary['end_date'].year + 1)]
-            self.period_combo.insertItems(1, self.years)
+            start_date = self.summary['start_date']
+            end_date = self.summary['end_date']
+            if start_date and end_date:
+                self.years = [str(i) for i in range(start_date.year, end_date.year + 1)]
+                self.period_combo.insertItems(1, self.years)
         item = self.currentItem()
         current_tx = item.data(0, Qt.UserRole) if item else None
         self.clear()
diff --git a/lib/wallet.py b/lib/wallet.py
index ce14706f1..90e47c436 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -952,6 +952,9 @@ class Abstract_Wallet(PrintError):
         from .util import timestamp_to_datetime, Satoshis, Fiat
         out = []
         init_balance = None
+        init_timestamp = None
+        end_balance = None
+        end_timestamp = None
         end_balance = 0
         capital_gains = 0
         fiat_income = 0