discord.js Cannot read properties of undefined (reading ‘send’) after sending the message

 Client.once('ready', () => {
    console.log('Bot online')
});

 Client.on("message", message => {
    if(message.channel.id = '915302302682873909') {
        const logChannel = Client.channels.cache.find(channel => channel.id === "915302371519770664");
    //send author
            logChannel.send(`${message.author}` + ": ")
                .then(message => console.log(`Sent message: ${message.content}`));
    //send message content
            logChannel.send(message.content)
                .then(message => console.log(`Sent message: ${message.content}`));
    }
})

If I start up my bot and send a message to see if it works, it sends the `${message.author}` + ": " as it should but then immediately crashes saying TypeError: Cannot read properties of undefined (reading 'send')
What’s also really weird is that sometime (I couldn’t figure out when) it sends both `${message.author}` + ": " and message.content before crashing.