fix lookup of the starting message

juniorguru_chick/bot.py

@@ -1,6 +1,7 @@
 import asyncio
 from datetime import datetime
 import logging
+from tracemalloc import start
 
 import discord
 from discord.ext import commands
@@ -21,19 +22,36 @@ def is_thread(message: discord.Message) -> bool:
     return message.type == discord.MessageType.thread_created
 
 
+async def fetch_starting_message(thread: discord.Thread) -> discord.Message | None:
+    """Returns the starting message of given thread"""
+    if thread.starting_message:
+        return thread.starting_message
+    try:
+        # thread.starting_message is often None although the thread
+        # has a starting message, so try to fetch it manually
+        return await thread.fetch_message(thread.id)
+    except discord.errors.NotFound:
+        return None
+
+
 async def create_thread(message: discord.Message, name_template) -> None:
     """Creates a new thread for given message"""
     weekday = datetime.now().weekday()
     name = name_template.format(weekday=DAYS[weekday], author=message.author.display_name)
     await message.create_thread(name=name)
 
 
-async def ensure_thread_name(thread: discord.Thread, name_template) -> None:
+async def ensure_thread_name(thread: discord.Thread, name_template) -> str | None:
     """Ensures given thread has a name"""
-    weekday = datetime.now().weekday()
-    name = name_template.format(weekday=DAYS[weekday], author=thread.starting_message.author.display_name)
-    if thread.name != name:
-        await thread.edit(name=name)
+    starting_message = await fetch_starting_message(thread)
+    if starting_message:
+        weekday = datetime.now().weekday()
+        name = name_template.format(weekday=DAYS[weekday], author=starting_message.author.display_name)
+        if thread.name != name:
+            await thread.edit(name=name)
+        return name
+    else:
+        return None
 
 
 @bot.event
@@ -78,9 +96,9 @@ async def on_thread_create(thread: discord.Thread) -> None:
     channel_name = thread.parent.name
     logger.info(f"Thread created in {channel_name!r}")
 
-    starting_message = thread.starting_message
+    starting_message = await fetch_starting_message(thread)
     if not starting_message:
-        logger.info("Thread has no starting message, skipping")
+        logger.warning(f"Thread {thread.name} has no starting message, skipping")
         return
 
     if channel_name == "ahoj":