[FS#3417] /etc/config/luci seems to be corrupt, unable to find section 'main'

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - ThinkPadX220 (ThinkPadX220) 

Attached to Project - OpenWrt/LEDE Project
Summary -  /etc/config/luci seems to be corrupt, unable to find section 'main'
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
 - Software versions of OpenWrt/LEDE release, packages, etc.
 - Steps to reproduce
   

OpenWRT 19.07.4 on xRX200 rev 1.2 (BT Home Hub 5A) with all packages up to date.
After running the router for a while I'll try to login to the page and get this error:
/usr/lib/lua/luci/dispatcher.lua:426: /etc/config/luci seems to be corrupt, unable to find section 'main'

This would normally be accompanied with the 5GHz channel set to 149 (which is a paid-for channel in the UK).
Checking /etc/config/luci looks fine to me and sometimes service rcpd restart works but other times it leaves Luci in an unusable state. 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3417

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