This tutorial will help you if WhatSender is sending the same message more than once to the same contact.
If you detect duplicate messages, stop the current send if it is still in progress. This will help prevent more contacts from receiving repeated messages.
Then, follow these solutions in order.
Solution 1: clear WhatSender’s memory
The first recommended solution is to clear WhatSender’s memory.
WhatSender stores temporary information from your sends in the browser. Over time, especially if you send many messages, this data can accumulate and cause errors such as slowness, freezing, or duplicate messages.
Before clearing the memory, keep in mind that this action will delete the history saved in the extension.
If you need to keep your reports, download them first from the History tab. You can follow this tutorial: https://support.what-sender.com/en/history-tab-report-download/
To clear the memory:
- Open WhatSender.
- Go to the User tab.
- Scroll down to the advanced settings section.
- Click Clear memory.
- Close and reopen WhatSender.
- Log in again from the User tab if the extension asks you to.
- Run a test with a small number of contacts.
After clearing the memory, check if the duplicate message issue disappears. Test with only 10 contacts.
Solution 2: reset the settings and check the sending times
If you changed the settings by mistake or reduced the sending times too much, WhatsApp Web may not have enough time to process each message correctly.
When the interval between messages is too short, errors may appear during the send, including duplicate messages.
To return to the recommended settings:
- Open WhatSender.
- Go to the User tab.
- Scroll down to advanced settings.
- Click Reset settings.
- Do not change any other options after resetting.
- Close and reopen WhatSender.
Run a test with 10 contacts.
If you need to adjust the sending times after resetting, do it carefully. We do not recommend reducing the time between sends too much. WhatsApp Web needs a few seconds to process each message. Here is a tutorial that can guide you: https://support.what-sender.com/en/how-to-configure-sending-times/
Solution 3: use the extension pinned to the browser
If you are using WhatSender in floating mode, we recommend that you stop using it that way.
Floating mode may cause unexpected behavior on some computers or browsers, including duplicate messages.
To avoid this, use the extension pinned to the browser.
To do this:
- Open Google Chrome.
- Find the extensions icon in the upper-right corner of the browser.
- Find WhatSender in the list of extensions.
- Click the pin icon.
Open WhatSender from the pinned icon in the browser bar.
After doing this, try running a small test send.
Solution 4: remove the WhatsApp desktop app
WhatSender works with WhatsApp Web from the browser, not with the WhatsApp desktop app.
If you have the WhatsApp application installed or open on your computer, it may create conflicts with WhatsApp Web and cause unexpected behavior, such as duplicate messages or connection errors.
To avoid this, we recommend removing the WhatsApp desktop app and using only WhatsApp Web from the browser.
You must use WhatsApp from: https://web.whatsapp.com
After removing or closing the desktop app:
- Close all WhatsApp windows.
- Open Google Chrome.
- Go to WhatsApp Web.
- Wait until your chats fully load.
- Open WhatSender from the pinned extension.
- Run a test with a small number of contacts.
Solution 5: do not click “Send” several times
If WhatSender takes a few seconds to start sending, avoid clicking the Send button several times.
By clicking repeatedly, you may start the same send more than once and cause duplicate messages.
After clicking Send, wait for WhatSender to process the campaign and check the progress from the History tab.
If it looks like nothing is happening, wait a few seconds before trying again.
Solution 6: place your number as the first contact in the list
If messages are still being duplicated after applying the previous solutions, the issue may be related to the first number in your contact list.
This can happen if the first number is incorrect, incomplete, or has a format that WhatsApp Web does not recognize correctly.
To fix it, you can place your own phone number as the first contact in the list.
To do this:
- Make sure to write your number with the corresponding country prefix.
- You can include the prefix directly in your database or use the general prefix in WhatSender, but not both options at the same time.
- Click the first + button in the list to add a new line.
- Copy the number that was in the first line and paste it into the second line.
- In the first line, write your own phone number.
- Check that your number is written correctly, with no spaces, signs, hyphens, or symbols.
- In WhatsApp Web, select any conversation that is not your own.
- Run a test send.
With this adjustment, WhatSender will start the send with your own number as the first contact, which can help prevent duplicate messages if the error was related to the first number in the list.
Still need help?
If messages are still being sent duplicated or repeated after following these steps, we can review your case individually.
To help you better, we need you to send us a video showing the problem. Without a visual reference, it is difficult to identify what is going wrong.
In the video, we need to clearly see:
- How you import or copy the contacts into WhatSender. It is important that the numbers are clearly visible.
- How your User tab is configured. Please scroll down so we can see the full configuration.
- How you write and configure the message before sending it.
- What happens during the sending process in the History tab. This tab must be open and visible, not minimized.
- It is also important that, if you are using attachments, we can see how you upload them and what type of file you are sending.
To record the video, you can use a free tool such as Loom. Here is the tutorial with the instructions
Before sending us the video, please review it. If you cannot clearly see the extension, the numbers, and the actions you are taking, we will not be able to see them clearly either. With a clear and complete video, we will be able to better identify the error and help you find a solution.
Then, send us the video through our contact form: contact support.
Our team will review your case and reply within approximately 1 to 2 business days, Monday to Friday.