Bug - TicketID attribute multiplies in URL after pressing Back in AgentTicketZoom

[BuilderNSV]

Environment

• Server OS: Linux
• Browser: Firefox
• Znuny version: 7.1.2

Expected behavior

URL should stay unchanged after return back from AgentTicketZoom

Actual behavior

On exit from AgentTicketZoom by pressing Back button TicketID attribute in URL multiplies

How to reproduce

Steps to reproduce the behavior:

1. Create any one ticket by phone
2. Go to Dashboard. See that URL looks as localhost/znuny/index.pl?Action=AgentDashboard
3. View ticket - go to AgentTicketZoom by clicking on ticket
4. See that URL looks like localhost/znuny/index.pl?Action=AgentTicketZoom ;TicketID=5
5. Press Back button on AgentTicketZoom
6. See that URL became localhost/znuny/index.pl?Action=AgentDashboard ;TicketID=5 (compare with step 2)
7. Repeat step 3 and step 5
8. See that URL became localhost/znuny/index.pl?Action=AgentDashboard ;TicketID=5;TicketID=5
9. If continue to repeat steps 3 and 5 URL will have multiple TicketID attributes