MySQL Bugs: #91979: Unhandled exception on closing tab and quitting Workbench itself

Bug #91979	Unhandled exception on closing tab and quitting Workbench itself
Submitted:	11 Aug 2018 6:53	Modified:	11 Aug 2018 13:18
Reporter:	Ryusuke Kajiyama	Email Updates:
Status:	Can't repeat	Impact on me:	None
Category:	MySQL Workbench	Severity:	S3 (Non-critical)
Version:	8.0.12	OS:	MacOS
Assigned to:		CPU Architecture:	x86

Description:
Env:
 MySQL Server 8.0.12 Community
 MySQL Workbench 8.0.12 Community

Once opened "Options File" tab in Administration, then try to close it, dialog box below is shown and unable to close the tab.
====
Unhandled exception: 'Box' object has no attribute 'cfg_be'

Check the log for more details.
====

Even after switching to other tabs like "Server Status", unable to close the tab and get same error.
On finishing MySQL Workbench itself, till the same error message comes up.

Screenshots attached.

How to repeat:
After connected to MySQL Server,
1) Open "Options File" in Administration
2) Close tab from x mark in tab

Error on closing Options File tab

Attachment: OptFile.jpeg (image/jpeg, text), 126.59 KiB.

Error on closing after switched to other tab

Attachment: OtherTab.jpeg (image/jpeg, text), 141.29 KiB.

Error on closing Workbench

Attachment: OnQuit.jpeg (image/jpeg, text), 115.70 KiB.

Error message in WB log

Attachment: ErrorInLog.txt (text/plain), 1.26 KiB.

Thank you for the bug report. I couldn't repeat on below environment:

 Model Name:	MacBook Pro
  Model Identifier:	MacBookPro9,2
  Processor Name:	Intel Core i5
  Processor Speed:	2,5 GHz
  Number of Processors:	1
  Total Number of Cores:	2
  L2 Cache (per Core):	256 KB
  L3 Cache:	3 MB
  Memory:	16 GB
  Boot ROM Version:	MBP91.00DA.B00
  SMC Version (system):	2.2f44
  Serial Number (system):	C02HVRJMDTY3
  Hardware UUID:	F3ED086F-09FA-5A52-977A-3F072F404FBB
  Sudden Motion Sensor:
  State:	Enabled

After removing Configuration Directory /Users/salika/Library/Application Support/MySQL/Workbench , this issue does not happen again. That directory contained files of 6.3.

Some users upgraded from previous version may be affected. I suggest it to be documented.

Got the same error message with Ryusuke.

I'm using:
Mac OS High Sierra 10.13.6
MySQL workbench 8.0.12

error message: Unhandled exception: 'Box' object has no attribute 'cfg_be'

It is the first time I install MySQL on this computer. I believe it's not caused by the upgrade.