Support » Plugin: Booster for WooCommerce » Critical Error after updating to 5.6.4

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  • Plugin Author ronyp


    Hello @beachholiday,

    Sorry for the inconvenience,

    We have released the new version of Booster for WooCommerce and Booster plus with the above fix. Can you upgrade the Booster plus plugin and give it a try?

    If still you are facing the same issue, Could you please export your Booster settings, and error log and share the file with me so that I could replicate the issue?

    Kind Regards,
    RonyP – Support Team

    Can confirm issue with 5.6.4

    An error of type E_COMPILE_ERROR was caused in line 168 of the file /var/www/htdocs/wp-content/plugins/woocommerce-jetpack/woocommerce-jetpack.php. Error message: Cannot redeclare _load_plugin_class() (previously declared in /var/www/htdocs/wp-content/plugins/booster-plus-for-woocommerce/booster-plus-for-woocommerce.php:163)

    WordPress version 6.0.2
    Active theme: Salient Child Theme (version 0.1)
    Current plugin: Booster for WooCommerce (version 5.6.4)
    PHP version 7.4.26

    Plugin Author ronyp


    Hello @beachholiday , @scollonp

    It seems you are using both free and plus versions of the booster plugin.
    If you are using the plus version, you do not need to activate the free version.

    Please try to deactivate the free version for now if you are using the paid one.

    Kind Regards,
    RonyP – Support Team

    Is this what causes the error @ronyp?

    Thread Starter Pieter Sand


    Dear @ronyp

    Many thanks for this tip.

    I wasn’t aware that the free Booster plugin should be de-activated, if we also use the paid Booster Plus version, i.e. Plus seemed like a paid add-on.

    When we roll back, we are seeing the wp_mail pluggable function error message:

    It is a pity that your solution for Booster Plus on this page was removed by an admin:

    Before it was removed, I remember seeing this solution:

    Files to replace:

    Source Files with fixes:

    Can you confirm that this is still correct?


    I just found this, I always (for years) had both plugins active…

    I thought it was the way it should be. Like Free been the basic plugin and Plus just the extensions.

    I am completely sure that was the way we were told to do.

    Well, now I just have the Plus (5.6.2) active and the Free deleted and I am working fine.


    I too believe both plugins were required originally, @caban13. This must have changed somewhere along the line.

    Thread Starter Pieter Sand


    Dear @ronyp

    Sorry, I noticed I posted the wrong link to the fix you had offered.

    This should be it:

    Please confirm.


    Plugin Support David G


    Hi @beachholiday

    Thanks for your message.

    SMTP issue is solved in latest version. Please deactivate the booster free version and upgrade booster plus. Let us know if you are still getting any errors.

    Thread Starter Pieter Sand


    Dear @gravid7 and @ronyp

    Many thanks for this developing this fix.

    It came through this morning as an update and does indeed solve the issues.

    We have de-activated / deleted the free Booster plugin and only have the paid Booster Plus plugin active now.

    Many thanks for your help.


Viewing 10 replies - 1 through 10 (of 10 total)
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