@client.event() causing @bot.command()

Question

When I first ran the code it worked, the bot responded to both commands and on_message events. But now I am confused as to what went wrong. I tried using

await bot.process_commands(message) 

but I received an attribute error: 'NoneType' object has no attribute 'id'

this is the code for the @bot.command

@bot.command()
async def wish(ctx, arg1, arg2):
    """
    !wish name age  
    """
   
    await ctx.send(f'HAPPY BIRTHDAY {arg1}! Have an awesome {arg2} birthday and I hope all your wishes come true!')

my @client.event is as follows:

@client.event 
async def on_message(message):
    if message.author == client.user:
        return 
    
    if any (word in message.content for word in intro_messages):
        await message.channel.send('Hello!')

I have two other events which I have not included which is a on_message_edit and on_reaction_add function.

I checked other responses to similar questions but none seemed to fit my code. Any advice is appreciated!