Next calendar event AppleScript widget halts all other script widgets

Describe the bug
A widget which uses AppleScript to show the next calendar event doesn't launch and halts all other AppleScript widgets. AppleScript in question is here:

The script works well in Script Editor and when I hit "Run Script" in Advanced Configuration. However, it doesn't render anything on the Touch Bar and all other AppleScript widgets do not initiate at all. Instead, they just show their titles (e.g. "Current Song", "Weather") - see screenshot below.

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


Device information:

  • Type of Mac: MacBook Pro (13-inch, 2017)
  • macOS version: 10.13.6
  • BetterTouchTool version: 2.547

Additional information: