Segementation fault on changing port twice

[bortkiewicz]

Describe the bug
When changing the Competitive Companion port for the second time, the app crashes.

To Reproduce

1. Change port
2. Here it would show

[18:34:29] [Companion] [Changing port to 10045]
[18:34:29] [Companion] [Stopped Server]

3. Change port again
4. Segmentation fault

Expected behavior
no segfault

Screenshots

QProcess: Destroyed while process ("g++") is still running.
Segmentation fault (core dumped)```

**Desktop (please complete the following information):**
 - OS: Linux Lenovo-K450e 5.3.0-24-generic #26-Ubuntu SMP Thu Nov 14 01:33:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux (Lubuntu Eoan)
 - Browser: Not applicable
 - Version: 3.0.0

**Smartphone (please complete the following information):**
 - Device: na
 - OS: na
 - Browser na
 - Version na

**Additional context**
n/a

[caretaker-claire]

Hi testitem
Thanks for Opening a new Issue here. I will also thank you for strictly following the Issue Templates.
I will add an appropriate tag to your Issue.

Have Patience, One of our Cool Contributors will help you soon.

[coder3101]

Do you change port to value less than 10K?

Okay you can't change to below 10K!

Possibly nullptr exception or socket exception. I will look into it.