Fix TypeError: Invalid parameter(s)

TypeError: Invalid parameter(s)
    at c (/usr/src/app/node_modules/enhanced-ms/dist/index.js:1:2015)
    at Object.interactionRun (/usr/src/app/src/commands/giveaways/giveaway.js:270:29)
    at Object.handleSlashCommand (/usr/src/app/src/handlers/command.js:140:17)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async module.exports (/usr/src/app/src/events/interactions/interactionCreate.js:18:5)

src/commands/giveaways/giveaway.js

@@ -267,7 +267,8 @@ module.exports = {
     //
     else if (sub === "edit") {
       const messageId = interaction.options.getString("message_id");
-      const addDurationMs = ems(interaction.options.getInteger("add_duration"));
+      const addDur = interaction.options.getInteger("add_duration");
+      const addDurationMs = addDur ? ems(addDur) : null;
       if (!addDurationMs) {
         return interaction.followUp("Not a valid duration");
       }