diff --git a/electrum/gui/qt/history_list.py b/electrum/gui/qt/history_list.py
index 23c617969..061d0e748 100644
--- a/electrum/gui/qt/history_list.py
+++ b/electrum/gui/qt/history_list.py
@@ -24,6 +24,7 @@
 # SOFTWARE.
 
 import os
+import sys
 import datetime
 from datetime import date
 from typing import TYPE_CHECKING, Tuple, Dict
@@ -138,7 +139,11 @@ class HistoryModel(QAbstractItemModel, Logger):
         timestamp = tx_item['timestamp']
         if is_lightning:
             status = 0
-            status_str = format_time(int(timestamp))
+            if timestamp is None:
+                timestamp = sys.maxsize
+                status_str = 'unconfirmed'
+            else:
+                status_str = format_time(int(timestamp))
         else:
             tx_hash = tx_item['txid']
             conf = tx_item['confirmations']
@@ -151,7 +156,7 @@ class HistoryModel(QAbstractItemModel, Logger):
                 status, status_str = self.parent.wallet.get_tx_status(tx_hash, tx_mined_info)
             # we sort by timestamp
             if conf<=0:
-                timestamp = time.time()
+                timestamp = sys.maxsize
 
         if role == Qt.UserRole:
             # for sorting