it's just a warning.
Please check table data via phpMyAdmin.
Open table "pages" and find rows with controller "pages/product/category"
You will see another columns "key_param" and "key_value".
Please check if some data presents in "key_param" but "key_value" is empty.
To fix warning you should be sure that both columns are filled or empty.
Please check table data via phpMyAdmin.
Open table "pages" and find rows with controller "pages/product/category"
You will see another columns "key_param" and "key_value".
Please check if some data presents in "key_param" but "key_value" is empty.
To fix warning you should be sure that both columns are filled or empty.

