NSInvalidArgumentException when attempting to install AltStore to iPad Pro

Describe the bug
During the installation process of AltStore to my iPad, AltServer crashes after popping up a warning about how proceeding will potentially invalidate my other certificates. I select continue, AltServer crashes.

To Reproduce
Steps to reproduce the behavior:

1. Install AltServer as directed (mail plugin, trust iPad, wifi, etc)
2. Go to install altstore to iPad
3. Enter AppleID info
4. Receive certificate warning
5. Hit continue
6. Program crashes

Expected behavior
For AltStore to be installed on the iPad

Screenshots
Crash log:
https://hastebin.com/ajiqaqakow.php

Desktop (please complete the following information if applicable):

• OS: macOS
• Version: Catalina

iPhone (please complete the following information):

• Device: iPad Pro 4th Gen
• iOS: 13.4.1

Additional context and logs
Add any error logs or any other context about the problem here.

Start by reviewing the linked crash log and reproducing the installation steps on macOS Catalina with an iPad Pro 4th Gen running iOS 13.4.1. Trace the NSInvalidArgumentException raised after continuing past the certificate warning. Done means AltStore installs successfully without AltServer crashing.