diff --git a/.changeset/mean-mails-pay.md b/.changeset/mean-mails-pay.md
new file mode 100644
index 0000000000000..b2d32b798e1c1
--- /dev/null
+++ b/.changeset/mean-mails-pay.md
@@ -0,0 +1,5 @@
+---
+'@rocket.chat/meteor': patch
+---
+
+Fixes Slack messages being incorrectly saved on import
diff --git a/apps/meteor/app/importer/server/classes/converters/MessageConverter.ts b/apps/meteor/app/importer/server/classes/converters/MessageConverter.ts
index cb4cf8047470d..e9e7295078c8d 100644
--- a/apps/meteor/app/importer/server/classes/converters/MessageConverter.ts
+++ b/apps/meteor/app/importer/server/classes/converters/MessageConverter.ts
@@ -1,5 +1,6 @@
 import type { IImportMessageRecord, IMessage as IDBMessage, IImportMessage, IImportMessageReaction } from '@rocket.chat/core-typings';
 import { Rooms } from '@rocket.chat/models';
+import { removeEmpty } from '@rocket.chat/tools';
 import limax from 'limax';
 
 import type { UserIdentification, MentionedChannel } from './ConverterCache';
@@ -84,7 +85,7 @@ export class MessageConverter extends RecordConverter<IImportMessageRecord> {
 		const mentions = data.mentions && (await this.convertMessageMentions(data));
 		const channels = data.channels && (await this.convertMessageChannels(data));
 
-		return {
+		return removeEmpty({
 			rid,
 			u: {
 				_id: creator._id,
@@ -110,7 +111,7 @@ export class MessageConverter extends RecordConverter<IImportMessageRecord> {
 			alias: data.alias,
 			...(data._id ? { _id: data._id } : {}),
 			...(data.reactions ? { reactions: await this.convertMessageReactions(data.reactions) } : {}),
-		};
+		});
 	}
 
 	protected async convertMessageChannels(message: IImportMessage): Promise<MentionedChannel[] | undefined> {
diff --git a/apps/meteor/tests/unit/app/importer/server/messageConverter.spec.ts b/apps/meteor/tests/unit/app/importer/server/messageConverter.spec.ts
index dcf72bb9b50d6..22ffa2afd4f2a 100644
--- a/apps/meteor/tests/unit/app/importer/server/messageConverter.spec.ts
+++ b/apps/meteor/tests/unit/app/importer/server/messageConverter.spec.ts
@@ -92,6 +92,16 @@ describe('Message Converter', () => {
 				});
 		});
 
+		it('should not have properties with undefined values', async () => {
+			const converter = new MessageConverter({ workInMemory: true });
+
+			const converted = await converter.buildMessageObject(messageToImport, 'general', { _id: 'rocket.cat', username: 'rocket.cat' });
+
+			Object.entries(converted).forEach(([key, value]) => {
+				expect(value, `Property "${key}" should not be undefined`).to.not.be.undefined;
+			});
+		});
+
 		// #TODO: Validate all message attributes
 	});