diff --git a/main.py b/main.py
index dc2bd43..03dd06d 100644
--- a/main.py
+++ b/main.py
@@ -7,10 +7,9 @@ Extracts sensor data from Gadgetbridge SQLite database and publishes to Home Ass
 import os
 import sqlite3
 import json
-import time
 import logging
 from datetime import datetime, timedelta
-from typing import Dict, List, Optional, Any
+from typing import Dict, Any
 import asyncio
 import aiomqtt
 import re
@@ -292,10 +291,16 @@ class GadgetbridgeMQTTPublisher:
         row = cursor.fetchone()
         if row and row[0]:
             ts = row[0]
-            # If timestamp is in milliseconds, convert to seconds
-            if ts > 1e12:
-                ts = ts // 1000
-            return datetime.fromtimestamp(ts).isoformat()
+            try:
+                # Convert to int if needed
+                ts = int(float(ts))
+                # If timestamp is in milliseconds, convert to seconds
+                if ts > 1e12:
+                    ts = ts // 1000
+                return datetime.fromtimestamp(ts).isoformat()
+            except Exception as e:
+                self.logger.error(f"Invalid WAKEUP_TIME timestamp: {ts} ({e})")
+                return None
         return None
 
     def query_is_awake(self, cursor) -> Any: