Warning: substr() expects parameter 1 to be string, array given

[1] Symfony\Component\Debug\Exception\ContextErrorException: Warning: substr() expects parameter 1 to be string, array given
    at n/a
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/QueryType/QueryParameterContentViewQueryTypeMapper.php line 70

    at Symfony\Component\Debug\ErrorHandler->handleError('2', 'substr() expects parameter 1 to be string, array given', '/Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/QueryType/QueryParameterContentViewQueryTypeMapper.php', '70', array('contentView' => object(ContentView), 'queryParameterValue' => array('layout', 'article')))
        in  line 

    at substr(array('layout', 'article'), '0', '2')
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/QueryType/QueryParameterContentViewQueryTypeMapper.php line 70

    at eZ\Publish\Core\QueryType\QueryParameterContentViewQueryTypeMapper->evaluateExpression(object(ContentView), array('layout', 'article'))
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/QueryType/QueryParameterContentViewQueryTypeMapper.php line 55

    at eZ\Publish\Core\QueryType\QueryParameterContentViewQueryTypeMapper->extractParameters(object(ContentView))
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/QueryType/QueryParameterContentViewQueryTypeMapper.php line 40

    at eZ\Publish\Core\QueryType\QueryParameterContentViewQueryTypeMapper->map(object(ContentView))
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/Controller/Content/QueryController.php line 80

    at eZ\Publish\Core\MVC\Symfony\Controller\Content\QueryController->runQuery(object(ContentView), 'findLocations')
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/Controller/Content/QueryController.php line 53

    at eZ\Publish\Core\MVC\Symfony\Controller\Content\QueryController->locationQueryAction(object(ContentView))
        in  line 

    at call_user_func_array(array(object(QueryController), 'LocationQueryAction'), array(object(ContentView)))
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 144

    at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 64

    at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php line 69

    at Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(object(Request), '1', true)
        in /Users/clash82/Documents/workspace/ezplatform.lh/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php line 185

    at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
        in /Users/clash82/Documents/workspace/ezplatform.lh/web/app.php line 67