Unwanted echo in exception

[Geolim4]

Configuration

• PhpFastCache version: "7.0.2"
• PhpFastCache API version: "2.0.4"
• PHP version: "n/a"

Describe the bug

What does that echo here: https://github.com/PHPSocialNetwork/phpfastcache/blob/e11e864bd98f41a11a2522a6493bbe17454f6b0b/lib/Phpfastcache/Drivers/Predis/Driver.php#L94