Error when changing AJP port several times

[IskandarovRost]

Environment

• Platform version: 7.2.1
• CUBA Studio plugin version: 13.0.SNAPSHOT1977-191
• IntelliJ version: IntelliJ IDEA 2019.3.3 (Community Edition)
• Windows 10

Description of the bug or enhancement

• Minimal reproducible example 1) Create a project 2) Open project properties and change AJP port. And save settings. 3) Open project properties. Change AJP port back to 8009. 4) Change AJP port again