Describe the bug
While having either (or both) of the new cape switch or helmet switch options enabled, the error linked below occurs

To Reproduce
Steps to reproduce the behaviour:

1. Log in with TRP3: Classic 1.6.6 enabled
2. Enable the new Cape switch and/or the Helmet switch option in Frames settings
3. Change the Icons size and/or the Max icons per line slider
4. See error (as well as the Toolbar becoming empty and not changing size/formation)

Expected behaviour
No error. Duh..

Screenshots or error message
https://www.wowace.com/paste/998cf4fa

Version of the add-on:
Total RP 3: Classic 1.6.6

Did you try having Total RP 3 as the only enabled addon and everything else (especially something like ElvUI) disabled?
No. The error implies this is caused by some of the changes between 1.6.5 and 1.6.6