diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8d1609..52b12fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.4] - 2024-01-09
+### Fixed
+- Consider delisted symbol if `ticker_time` is None
+
 ## [1.0.3] - 2024-01-08
 ### Fixed
 - Add `None` check before restoring `best_triplet`
diff --git a/README.md b/README.md
index 035e22d..6b35258 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
   <img src="illustration.jpeg" width="250px" height="250px" alt="Triangular illustration">
 </p>
 
-# Triangular Arbitrage by OctoBot [1.0.3](https://github.com/Drakkar-Software/Triangular-Arbitrage/blob/master/CHANGELOG.md)
+# Triangular Arbitrage by OctoBot [1.0.4](https://github.com/Drakkar-Software/Triangular-Arbitrage/blob/master/CHANGELOG.md)
 [![PyPI](https://img.shields.io/pypi/v/OctoBot-Triangular-Arbitrage.svg)](https://pypi.python.org/pypi/OctoBot-Triangular-Arbitrage/)
 [![Dockerhub](https://img.shields.io/docker/pulls/drakkarsoftware/octobot-triangular-arbitrage.svg?logo=docker)](https://hub.docker.com/r/drakkarsoftware/octobot-triangular-arbitrage)
 
diff --git a/triangular_arbitrage/__init__.py b/triangular_arbitrage/__init__.py
index 1d0ac9c..1092de0 100644
--- a/triangular_arbitrage/__init__.py
+++ b/triangular_arbitrage/__init__.py
@@ -1,2 +1,2 @@
 PROJECT_NAME = "OctoBot-Triangular-Arbitrage"
-VERSION = "1.0.3"
+VERSION = "1.0.4"
diff --git a/triangular_arbitrage/detector.py b/triangular_arbitrage/detector.py
index 032a765..f1f0a21 100644
--- a/triangular_arbitrage/detector.py
+++ b/triangular_arbitrage/detector.py
@@ -27,7 +27,7 @@ def get_symbol_from_key(key_symbol: str) -> symbols.Symbol:
 
 def is_delisted_symbols(exchange_time, ticker, threshold = 1 * constants.DAYS_TO_SECONDS * constants.MSECONDS_TO_SECONDS) -> bool:
     ticker_time = ticker['timestamp']
-    return not (exchange_time - ticker_time <= threshold)
+    return ticker_time is None or not (exchange_time - ticker_time <= threshold)
 
 def get_last_prices(exchange_time, tickers, ignored_symbols):
     return [