Hello Erel,
Please find the log file attached.
I have :
- started b4a and opened an existing project
- moved the service's module "cover" to the left using the cross
- right clicked one time and saw the error message
- right clicked a second time and saw the error message again
- moved the service's module "cover" to the center of the cross to redock it
- right clicked and no error was thrown
- closed b4a
Many thanks