Error Occurs When Purchasing a Free Transaction from Marketplace

EXPECTED BEHAVIOR

Clicking 'Buy Now' on a free transaction in the Marketplace completes the order.

ACTUAL BEHAVIOR

Clicking 'Buy Now' on a free transaction in the Marketplace causes an error.

HOW TO REPRODUCE

1. Login to http://steemnova.intinte.org on Chrome 65.0.3325.109 using Android 8.1
2. Click on Marketplace in Left Menu
3. Locate a Transaction costing 0 Resources
4. Click 'Buy Now!'

TESTING ENVIRONMENT

• OS: Android 8.1
  
• Browser: Chrome 65.0.3325.109
  
• App Version: 1.8.0
  

RECORDING OF THE BUG

ERROR TEXT

WARNING
Message: Division by zero
File: /includes/classes/class.FleetFunctions.php
Line: 120
URL: https://steemnova.intinte.org/game.php?page=marketPlace&action=buy
PHP-Version: 7.0.28-1
PHP-API: fpm-fcgi
2Moons Version: 1.8.git
Debug Backtrace:
#0 /includes/classes/class.FleetFunctions.php(120): errorHandler(2, 'Division by zer...', 'FILEPATH ...', 120, Array)
#1 /includes/pages/game/ShowMarketPlacePage.class.php(110): FleetFunctions::GetMissionDuration(3500, 0, 9065, 2, Array)
#2 /includes/pages/game/ShowMarketPlacePage.class.php(211): ShowMarketPlacePage->doBuy()
#3 /game.php(57): ShowMarketPlacePage->show()
#4 {main}