Problem with Download PDF Report uploaded through API

I am facing below error when Downloading Report uploaded through API

Fatal error : Uncaught TypeError: Unsupported operand types: string + float in C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php:6535 Stack trace: #0 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php(16061): Mpdf\Mpdf->finishFlowingBlock(true) #1 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Tag\BlockTag.php(234): Mpdf\Mpdf->printbuffer(Array, 0) #2 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Tag.php(240): Mpdf\Tag\BlockTag->open(Array, Array, 1) #3 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php(13921): Mpdf\Tag->OpenTag(‘DIV’, Array, Array, 1) #4 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php(12500): Mpdf\Mpdf->WriteHTML(’<div style="tex…’, 4) #5 C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php(13447): Mpdf\Mpdf->_getHtmlHeight(’<div style="tex…’) #6 C:\Hemex LIS\xampp\htdocs\OpenEMR\interface\patient_file\report\custom_report.php(870): Mpdf\Mpdf->WriteHTML(’ <div class="co…’) #7 {main} thrown in C:\Hemex LIS\xampp\htdocs\OpenEMR\vendor\mpdf\mpdf\src\Mpdf.php on line 6535

Please provide me solution.