[FS#413] ubus_invoke_async: symbol not found

[LEDE Bugs]

The following task has a new comment added:

FS#413 - ubus_invoke_async: symbol not found
User who did this - howl (howl)

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Tested r3062-f784b3e195 in Archer C7 v2 and it's not solved. At the same time that bug hit me also happened that the router has Internet access but the LAN cannot access Internet, don't know if it could be related.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=413#comment1352