Solr HTTP error: OK (502) Error

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Fatal error: Uncaught Error: Unsupported operand types in /var/www/html/query.php:47 Stack trace: #0 /var/www/html/router.php(33): require_once() #1 /var/www/html/results.php(13): require_once('/var/www/html/r...') #2 {main} thrown in /var/www/html/query.php on line 47