Fixed #781

Author: Geolim4

lib/Phpfastcache/Drivers/Riak/Driver.php

@@ -145,7 +145,7 @@ public function getStats(): DriverStatistic
         return (new DriverStatistic())
             ->setData(\implode(', ', \array_keys($this->itemInstances)))
             ->setRawData($info)
-            ->setSize(false)
+            ->setSize(0)
             ->setInfo('Riak does not provide size/date information att all :(');
     }
-}
+}