Title: Activating plugin creates fatal error
Last modified: November 3, 2023

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# Activating plugin creates fatal error

 *  Resolved [swkf](https://wordpress.org/support/users/swkf/)
 * (@swkf)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/activating-plugin-creates-fatal-error/)
 * Hi there, 
   On my website I’ve installed the plugin, once I activated it, the 
   back-end gave me a fatal error. Upon reviewing the logs I came across this log:
 * Got error ‘PHP message: WordPress database error Illegal mix of collations (utf8mb4_unicode_ci,
   IMPLICIT) and (utf8mb4_unicode_520_ci,IMPLICIT) for operation ‘=’ for query \
   n\t\t\tINSERT IGNORE INTO wp_pronamic_pay_mollie_customer_users (\n\t\t\t\tcustomer_id,\
   n\t\t\t\tuser_id\n\t\t\t)\n\t\t\tSELECT\n\t\t\t\tmollie_customer.id AS mollie_customer_id,\
   n\t\t\t\twp_user.ID AS wp_user_id\n\t\t\tFROM\n\t\t\t\twp_pronamic_pay_mollie_customers
   AS mollie_customer\n\t\t\t\t\tINNER JOIN\n\t\t\t\twp_usermeta AS wp_user_meta\
   n\t\t\t\t\t\tON wp_user_meta.meta_value = mollie_customer.mollie_id\n\t\t\t\t\
   tINNER JOIN\n\t\t\t\twp_users AS wp_user\n\t\t\t\t\t\tON wp_user_meta.user_id
   = wp_user.ID\n\t\t\tWHERE\n\t\t\t\twp_user_meta.meta_key IN (\n\t\t\t\t\t’_pronamic_pay_mollie_customer_id’,\
   n\t\t\t\t\t’_pronamic_pay_mollie_customer_id_test’\n\t\t\t\t)\n\t\t\t\t\tAND\
   n\t\t\t\twp_user_meta.meta_value != ”\n\t\t\t;\n\t\t
 * Is there any way I can solve this fatal error? 
   Any help is very much appreciated!
   Cheers

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Reüel](https://wordpress.org/support/users/pronamic_reuel/)
 * (@pronamic_reuel)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/activating-plugin-creates-fatal-error/#post-17172419)
 * This error can happen with the database structure of older WordPress installations.
   We’ve recently identified a fix and an upcoming plugin update should resolve 
   the issue. Please stay tuned.
 * For full details about this issue, see [https://github.com/pronamic/wp-pronamic-pay-mollie/issues/32](https://github.com/pronamic/wp-pronamic-pay-mollie/issues/32)
 *  Plugin Author [Reüel](https://wordpress.org/support/users/pronamic_reuel/)
 * (@pronamic_reuel)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/activating-plugin-creates-fatal-error/#post-17180678)
 * This issue has been resolved in the just released Pronamic Pay version 9.6.0.

Viewing 2 replies - 1 through 2 (of 2 total)

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 * 2 replies
 * 2 participants
 * Last reply from: [Reüel](https://wordpress.org/support/users/pronamic_reuel/)
 * Last activity: [2 years, 7 months ago](https://wordpress.org/support/topic/activating-plugin-creates-fatal-error/#post-17180678)
 * Status: resolved