The article page does not appear if there are more than 1 tag. If the article has 1 or 0 tags, the detail page is showing. That's the error message:
0 - Argument 1 passed to Joomla\Utilities\ArrayHelper::getColumn() must be of the type array, object given, called in ............../components/com_tz_portfolio_plus/templates/elegant/html/default/mod_tz_portfolio_plus_portfolio/default.php on line 125
TZ Portfolio+ 2.0.6
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Best regards from Switzerland