Discord.js v13 [EMBED_FIELD_VALUE]: MessageEmbed field values must be non-empty strings

Question

    const key = `${message.guild.id}|${message.channel.id}|${message.id}`;

    if (MESSAGE_CACHE.has(key)) {
      const cachedMessage = MESSAGE_CACHE.get(key);
      const logChannel = message.guild.channels.cache.get(settings.log_channel);
      if (!logChannel) return;

      const embed = new MessageEmbed()
        .setAuthor("Ghost ping detected")
        .setDescription(
          `**Message**:
        ${cachedMessage.content}
        
        **Author:** ${cachedMessage.author.tag} \`${cachedMessage.author.id}\`
        **Channel:** <#${cachedMessage.channelId}>
        `
        )
        .addField("Members", cachedMessage.mentions.members, true)
        .addField("Roles", cachedMessage.mentions.roles, true)
        .addField("Everyone?", cachedMessage.mentions.everyone, true)
        .setFooter("Sent at: " + cachedMessage.createdAt);

      sendMessage(logChannel, { embeds: [embed] });
    }

If i delete a message with a ghost ping in it, it returns the error Unhandled Rejection at: RangeError [EMBED_FIELD_VALUE]: MessageEmbed field values must be non-empty strings. Any idea why this happeneds as the fields have valures

Answer 1

All the values you put there are not strings, so it will throw that error. Also, note that .mentions.members and .mentions.roles are Collection s, not arrays, so you need to convert them.

.addField("Members", `${Array.from(cachedMessage.mentions.members.values()).join(", ") || "None"}`, true)
.addField("Roles", `${Array.from(cachedMessage.mentions.roles.values()).join(", ") || "None"}`, true)
.addField("Everyone?", `${cachedMessage.mentions.everyone}`, true)
.setFooter("Sent at: " + `${cachedMessage.createdAt}`);

Answer 2

On .addField creating the error, to prevent this errors,

.addField("Members", `${cachedMessage.mentions.members || "Your word"}`, true)
.addField("Roles", `${cachedMessage.mentions.roles || "Your word"}`, true)
.addField("Everyone?", `${cachedMessage.mentions.everyone || "Your word"}`, true)
.setFooter("Sent at: " + cachedMessage.createdAt);

explanation: if your bot didn't get any members that pinged someone, instead of throwing an error, it will send a string