This Bug mostly affected larger servers:
When more than 22 players are online, the GUI will produce pages
The mentioned bug resulted in an error whenever someone tried going to the next page. This should be fixed now

Plans for the next updates:
This week will be rather stressful for me because of school, so updates will take some time, but here's a plan what I want to include:

Update 2.6:

• GUI-Back buttons
  
• Offline-Player bounty menu
  
• Filters for the bounty-player menu (search by name, eco-amount, number of bounties etc.)

Update 2.6.1:

• SQL support (might be moved into 2.6, depending on development speed)
  
• Setting bounties from the console

Note that this is NOT a definite plan on what will be added when, but rather a roadmap that gives a general idea on what is planned. This means:

• If features are deemed unready, they'll be moved into a later update
• I will still take Suggestions and will add them onto the list
  
• I am NOT promising that these features will be added in exactly that order