PDF class error

[hdewaart]

On the last update to 3.1.4 I receive this error:

exception 'yii\base\ErrorException' with message 'syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$'' in /var/www/html/planning/dev/vendor/kartik-v/yii2-grid/GridView.php:1395
Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleFatalError()
#1 {main}

error line:
if (!class_exists(Pdf::class)) {

A rollback to 3.1.3 the error is gone

env.
PHP 5.4.16
Yii 2.0.10

[kuJIorpaMM]

Same for me now. The ::class works in PHP 5.5+ (http://php.net/manual/en/language.oop5.basic.php)