some message types were causing an error and flooding the logs

bot.py

@@ -156,9 +156,12 @@ def symbol_detect_image(update: Update, context: CallbackContext):
     Makes image captions into text then passes the `update` and `context`
         to symbol detect so that it can reply cashtags in image captions.
     """
-    if update.message.caption:
-        update.message.text = update.message.caption
-        symbol_detect(update, context)
+    try:
+        if update.message.caption:
+            update.message.text = update.message.caption
+            symbol_detect(update, context)
+    except AttributeError:
+        return
 
 
 def symbol_detect(update: Update, context: CallbackContext):

requirements.txt

@@ -1,4 +1,4 @@
-python-telegram-bot==13.5
+python-telegram-bot==20
 requests==2.25.1
 pandas==2.0.0
 schedule==1.0.0