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NullReferenceException on loaded agent UI panel when removed by pooling system causes panel to stuck on screen

Description

If you open the Passport of a person that is afterwards leaving again by train, it becomes ipossible to cloes the passport again.

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COLLECTED HARDWARE DATA
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Device
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Model: MacBookAir7,2

Operating system: Mac OS X 10.13.4

RAM size: 8 GB

Battery status: Charging
Battery level: 0.29

Processor Device
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Type: Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz
Core count: 4
Frequency: 1 GHz

Grahpics Device
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Vendor: Apple
Type: Intel(R) Iris(TM) Graphics 6000
Memory Size: 1 GB

Screen Summary
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Full Screen: True
Resolution: 1440 x 900 @ 60Hz

Checklists

None

Status

Assignee

Olof

Reporter

Airport CEO In-Game Issue Reporter

Labels

None

Operating System

macOS

Components

Affects versions

Alpha 28.4-0

Priority

High