A bug to fix

[Demandro]

When I try to sell my old machinegun in Tarkus a critical error occurs:

Version: 0.9.010-PUBLIC-ELECTRON#2246 Message: Cannot read properties of undefined (reading 'quantity') Stack:
TypeError: Cannot read properties of undefined (reading 'quantity')
at file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/main.558689e4.js:1:11986699
at Array.forEach ()
at o.get (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/main.558689e4.js:1:11986601)
at o.get (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/main.558689e4.js:1:11988285)
at o.value (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/main.558689e4.js:1:11997986)
at Wa (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/vendors.4a7e7a5e.js:1:452203)
at Ha (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/vendors.4a7e7a5e.js:1:452002)
at qu (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/vendors.4a7e7a5e.js:1:492947)
at Cs (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/vendors.4a7e7a5e.js:1:479097)
at ks (file:///C:/Users/acer/Desktop/New%20folder/TestFolder/TiTS-public-0.9.010-win/resources/app/vendors.4a7e7a5e.js:1:479025)