Does anyone know the fix for this issue?

[Grammy]

It was reported as a known issue.

Undefined index: label

This portion of GenericMenu.template.php (2.1.4 default):

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<a ', !empty($sub['selected']) ? 'class="chosen" ' : '', ' href="', $url, $menu_context['extra_parameters'], '">', $sub['label'], !empty($sub['amt']) ? ' <span class="amt">' . $sub['amt'] . '</span>' : '', '</a>
I have to clear it out every so often, I assume when someone's been messing around with their personal messages, but I'm unclear.  I don't understand how to decipher the mysteries of github. 

[Illori]

https://github.com/SimpleMachines/SMF/pull/7733/commits/6cbf26c74ecca8e44a18dce8295d7201a08e0e03

these are the changes, if you do apply them now you may need to remove them to apply the next patch.

[Sir Osis of Liver]

The messages are harmless & can be ignored for now.

If it really bothers you, try this -

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                    /// Fudge to remove undefined errors
                    if (!isset($sub['label']))
                        $sub['label'] = null;

                    echo '
                                        <li>
                                            <a ', !empty($sub['selected']) ? 'class="chosen" ' : '', ' href="', $url, $menu_context['extra_parameters'], '">', $sub['label'], !empty($sub['amt']) ? ' <span class="amt">' . $sub['amt'] . '</span>' : '', '</a>
                                        </li>';


[Grammy]

Thank you, @Illori and @Sir Osis of Liver

It only bothers me today because, for some reason, they're blowing it up in there.  Thanks so much!