deployer: Deployment fails at installing Composer dependencies

Before submitting your issue, please make sure that you’ve checked all of the checkboxes below.

• You’re running the latest release version of Deployer.
• Ensure that you’re running at least PHP 5.5.9, you can check this by running php -v
• You’ve ran composer install --no-dev from the root of your installation.
• You’ve ran npm install --production from the root of your installation.
• You’ve ran rm -rf bootstrap/cache/* from the root of your installation.
• You have restarted the queue listener and node socket server.

To help us better understand your issue, please answer the following.

Expected behaviour

Install Composer Dependencies should install the dependencies.

Actual behaviour

The stage fails. Output is: Creating default object from empty value

Environment info

Operating System: Ubuntu PHP Version: PHP 5.6.18-1+deb.sury.org~trusty+1 (cli) Node Version: v0.10.25 Database System: MySQL Database Version: 5.6

Logs (see storage/logs/) or other output that would be helpful

(If logs are large, please upload as attachment).