Crash when resetting color for "Visual Separator"

On BTT: 5.748 (and some previous versions), pressing any of these buttons results in BTT crash:

this is 100% reproducible. I've sent the crash to your email.

Andreas, the crash is fixed, but is this expected - some colors reset upon save, "Background Dark Mode" despite configured as adaptive it is not - color should be black, but it is white in a dark mode.

BTT: 5.755

Weird, the colors seems to adapt fine here for dark / light mode. Could you copy & paste that separator here?

[
  {
    "BTTLastUpdatedAt" : 1763029623.024127,
    "BTTTriggerType" : 202,
    "BTTTriggerTypeDescriptionReadOnly" : "",
    "BTTTriggerTypeDescription" : "WINDOWS RELATED",
    "BTTTriggerClass" : "BTTTriggerTypeKeyboardShortcut",
    "BTTUUID" : "95109886-B069-4E53-BB96-CBE572BBF241",
    "BTTSeparatorFontColor" : "0.000000, 0.000000, 0.000000, 255.000000",
    "BTTSeparatorBackgroundColor" : "233.374676, 233.374676, 233.374676, 255.000000",
    "BTTShortcutKeyboardType" : 0,
    "BTTTriggerOnDown" : 1,
    "BTTShortcutKeyCode" : -1,
    "BTTShortcutAdvancedModifierKeys" : "233.374676, 233.374676, 233.374676, 255.000000",
    "BTTOrder" : 0,
    "BTTAutoAdaptToKeyboardLayout" : 0,
    "BTTGestureNotes" : "WINDOWS RELATED"
  }
]