Warning (2) : Trying to access array offset on value of type null [in /var/www/html/Lexicon2/src/Controller/AppController.php, line 160]
Warning (2) : Attempt to read property "hasOrigins" on null [in /var/www/html/Lexicon2/src/Controller/Component/LoadORTDComponent.php, line 20]
Warning (2) : Attempt to read property "hasRegions" on null [in /var/www/html/Lexicon2/src/Controller/Component/LoadORTDComponent.php, line 24]
Warning (2) : Attempt to read property "hasTypes" on null [in /var/www/html/Lexicon2/src/Controller/Component/LoadORTDComponent.php, line 28]
Warning (2) : Attempt to read property "hasDictionaries" on null [in /var/www/html/Lexicon2/src/Controller/Component/LoadORTDComponent.php, line 35]
Warning (2) : Attempt to read property "id" on null [in /var/www/html/Lexicon2/src/Controller/WordsController.php, line 73]
Warning (512) : Unable to emit headers. Headers sent in file=/var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=37 [in /var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 65]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 163]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/html/Lexicon2/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 192]
Error: Expression `language_id` is missing operator (IS, IS NOT) with `null` value.

Expression `language_id` is missing operator (IS, IS NOT) with `null` value. 📋

InvalidArgumentException
CORE/src/Database/Expression/QueryExpression.php at line 747 (edit)
            $operator '!=';
        }
        if ($value === null && $this->_conjunction !== ',') {
            throw new InvalidArgumentException(
                sprintf('Expression `%s` is missing operator (IS, IS NOT) with `null` value.'$expression)
            );
        }

If you want to customize this error message, create templates/Error/error500.php