[E_WARNING] Undefined array key "extraFaIcons"

When attempting to rebuild meta-data, the font awesome icon service keeps erroring:
Code:

$ php cmd.php xf:rebuild-master-data -v
Importing... Master data (Templates)
Rebuilding... templates . . .
Rebuilding... permissions (2620)
Rebuilding... permissions (10176)

In UsageAnalyzer.php line 566:

  [ErrorException]
  [E_WARNING] Undefined array key "extraFaIcons"


Exception trace:
  at /var/www/sites/src/XF/Service/Icon/UsageAnalyzer.php:566
 XF::handlePhpError() at...

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