Hydrator Error when using Doctrine_Pager

[wildanm]

When using Doctrine_Pager i got this error :

2017/03/18 10:45:24 [error] 4715#4715: *118 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Call to a member function getLast() on boolean in ....lib/vendor/lexpress/doctrine1/lib/Doctrine/Hydrator/RecordDriver.php:110
Stack trace:
#0 .../lib/vendor/lexpress/doctrine1/lib/Doctrine/Hydrator/Graph.php(269): Doctrine_Hydrator_RecordDriver->setLastElement(Array, false, false, 'nilai', true)
#1 ...

The error is gone with this simple fix in : lib/vendor/lexpress/doctrine1/lib/Doctrine/Hydrator/RecordDriver.php:110

But i'm not sure, if this is the proper solution.

        if (count($coll) > 0) {
			if($prev[$dqlAlias] == null) {
				return ;
			} else {
              $prev[$dqlAlias] = $coll->getLast();
		    }
        }