Complex plugin conflict

This morning one of my team members send me a message with a fatal error when he tried to access the wp-admin panel.
By reading the error status, it was shown in the wp-smush plugin. So I've uninstalled it via the hub, and again I've got the same kind of error with wp-defender.
I asked but nobody seems to have done a manipulation on the website between yesterday 18h and this morning.
Same manipulation with Defender, and again the same error. And the wp-admin page showing an error 500. So I've backed up all the plugin, with a backup from yesterday at 12h. But the error is still there.
WP admin page is showing an error 500 when some of the plugins are activated at the same time (YOAST SEO, WP Smush, WP Cost Estimation & Payment Forms Builder, Defender).

  • Romain
    • New Recruit

    Hi James,

    I don't remember that I've created this ticket, may Katya (I feel like I misspelling her name) created it when I used the live chat. Sorry to her because I've got to leave without a proper disconnection.

    The main issue seems to come from the "WP Cost Estimation & Payment Forms Builder" plugin, since YOAST and all of the WPMU Dev plugins worked well together after some test.

    I really don't know why, but my boss order me to remove every WPMU Dev plugin after this, even if their not the at origin of the bug.. From my dev view, they're pretty powerfull and user-friendly and I think it's a mistake to don't use them. The order are the order..

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