Setting theme to classic from custom theme causes debugger to choke on Administrator role

• Type: Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: 7.2.10 DXP FP2
• Fix Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Component/s: Liferay Themes > Classic, Sites Management
• Labels: None
• Bug Type: UX / Visual - Desktop

Setting a default theme to be custom and then trying to create a site that uses classic theme causes a debugging error in Chrome. Attached output of the error.

Steps
0) As omniadmin (portal admin)
1) Create and apply a custom theme as default in instance settings
2) Create a site
3) Use the public pages configuration section to change theme of site to classic