I ran into this problem and none of these suggestions worked for me. The reason in my case was that phpmyadmin had sorting for the modified / dropped column, and I needed to fix it. Here is what resolved this for me.
In phpmyadmin, select your database in the left navigation pane. You will see all your tables, in which case we are interested in 'systeem_eisen' . After you find the table, click Structure .

Now you will see all the columns in the table. All you have to do is delete the sort or change it accordingly.


Now you can open the table.
Eternalhour
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