Error - upgrading from version 1.11.1 to version 1.12 (no replies)

Hi,

I am getting this error while I upgrading from version 1.11.1 to the new version 1.12

Critical Error during the update process:

/home/XXX/XXX/piwi/core/Updates/1.12-b1.php:
Error trying to execute the query 'ALTER TABLE `piwik_log_link_visit_action`
ADD `custom_float` FLOAT NULL DEFAULT NULL'.
The error was: SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'custom_float'

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I also tried through phpmyadmin but still the error appears.

Please advice.

Thanks,
Sam