custom apple script slider widget freeze

whenever I update
color of track of custom apple script slider widget, by
tell application "BetterTouchTool"
update_trigger "UUID" json "{"BTTTriggerConfig":{"BTTTouchBarButtonColor" : "4.0, 204.0, 255.0, 255.000000"}}"
end tell

color won't change when I FIRST-TIME trigger the command, but only freezes custom apple script slider widget

  • color do change after that first trial (but the widget is still frozen until I restart BTT)

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
Touch Bar

Device information:

  • Type of Mac: macbook-pro
  • macOS version: os 10.14
  • BetterTouchTool 2.644 -> Broken
  • BetterTouchTool 2.643 -> Broken (assuming something happen with this version)
  • BetterTouchTool 2.636 -> Worked fine