[Emergency] Uncaught InvalidArgumentException: ViewableData->customise(): $data must be an associative array or a ViewableData instance

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Line 268 in /var/www/coworking-noe.at/httpdocs/vendor/silverstripe/framework/src/View/ViewableData.php

Source

259     {
260         if (is_array($data) && (empty($data) || ArrayLib::is_associative($data))) {
261             $data = new ArrayData($data);
262         }
263 
264         if ($data instanceof ViewableData) {
265             return new ViewableData_Customised($this, $data);
266         }
267 
268         throw new InvalidArgumentException(
269             'ViewableData->customise(): $data must be an associative array or a ViewableData instance'
270         );
271     }
272 
273     /**
274      * Return true if this object "exists" i.e. has a sensible value

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