ERROR: Uninitialized string offset 52 on line 818 in file /var/www/html/php/vendor/propa/tcpdi/tcpdi_parser.php

[gohelkiran30]

Getting this warning in log while adding a pdf file as template
ERROR: Uninitialized string offset 52 on line 818 in file /var/www/html/php/vendor/propa/tcpdi/tcpdi_parser.php

        $this->AddPage();

        $this->setSourceFile(__DIR__ . '/PDF_FILE_HERE.pdf');

        $idx = $this->importPage(1);

        $this->useTemplate($idx);