Error in the database with strings - how to fix it?

Question

MySQL

The same error occurs when adding entries to the guestbook ("Error adding entry!") and when trying to register. The code is almost the same.
Create database
CREATE TABLE `mysite-local`.`guestbook` ( `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT , `name` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `comment` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , PRIMARY KEY (`id`)) ENGINE = MyISAM CHARSET=utf8 COLLATE utf8_general_ci;
In phpMyAdmin - "MySQL returned an empty result (i.e. zero rows). (Query took 0.0005 seconds)"
Open Server
in MySQL Manager - "key index 'index 1" does not contain any column"

Answer 1

Insert in the table (which creation code you resulted) cannot produce such error. Since there is no index "Index 1" in it.
Look at the indexes set on the table you are inserting into.