I did some research about the unexpected crash with the FTP Homebrew.
My crash happened first when I changed Tint to #103c6e (Red: 10, Green: 60, Blue: 110)
It crashed too when Green value is set (> 0) while Red is 10 and Blue is 110.
Some tests:
Red: 10, Green: 0, Blue: 110 -> Don't crash
Red: 0-9, Green: 1, Blue: 0 -> Don't crash
Red: 10, Green: 1, Blue: 0 -> Crash
Red: 11, Green: 1, Blue: 0 ->Don't crash
Red: 9, Green: 1, Blue: 110 -> Don't crash
Red: 10, Green: 1, Blue: 110 -> Crash
Red: 11, Green: 1, Blue: 110 -> Don't crash
PS: When selecting (not launching) this homebrew or the themehax_installer.