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MySQL server has gone away in /var/www/html/pl/en/app/lib/Db/mysqli.php line 536:
  1. In Db_mysqli->getTables() in Db line 409
  2. At Db->getTables() in ConfigurationCheck line 162
  3. At ConfigurationCheck::DBOutOfDateQuickCheck() in line
  4. At ReflectionMethod->invoke() in ConfigurationCheck line 60
  5. At ConfigurationCheck::performQuick() in index line 53
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