Magento 2.3 Topmenu override declaration error

Question

Declaration of _getHtml

Should be compatible with Magento\Theme\Block\Html\Topmenu::_getHtml(Magento\Framework\Data\Tree\Node $menuTree, $childrenWrapClass, $limit, array $colBrakes = Array)

Answer 1

Ibnab\MegaMenu\Block\Html\Topmega.php

protected function _getHtml(
    \Magento\Framework\Data\Tree\Node $menuTree,
    $childrenWrapClass,
    $limit,
    array $colBrakes = []
)

Also replace :

$colStops = null; to $colStops = [];