i just trying to upgrade to 5.2.0 from 5.1.10 and the upgrading process was aborted when I clicked on OK.
This is the second time i get this same error (I already have this error when i upgarde to 5.1.10 from 5.1.9)
Please see :

After refreshing the page (F5), the upgrade continues and finished smoothly.
1- Why i get this error ?
PHP Version : 5.4.45
MySQL Version : 5.5.44-37.3
Apache Version : 2.2.27
No add-ons
Thank yo for your assistance.
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