Why does the 502 Bad Gateway error pop up in the opencart admin panel?

Question

opencart

Hello! Error 502 occurs when Exporting data to XLSX file. I use the Export/Import Tool (V3.16) for OpenCart 2.x module.
In the logs it says:
printerstore.ru [Thu Oct 18 16:19:51 2018] [error] [pid 820] mod_access_compat.c(352): [client 66.249.66.128:57232] AH01797: client denied by server configuration: /home/v/vegasd/printerstore.ru/public_html/ads.txt
printerstore.ru [Fri Oct 19 02:55:01 2018] [error] [pid 40574] sapi_apache2.c(362): [client 93.158.166.1:54276] PHP Fatal error: Uncaught Error: Call to a member function getInformations( ) on null in /home/v/vegasd/printerstore.ru/public_html/system/modification/catalog/controller/common/header.php:57\nStack trace:\n#0 /home/v/vegasd/printerstore.ru /public_html/vqmod/vqcache/vq2-system_modification_system_engine_action.php(65): ControllerCommonHeader->index(Array)\n#1 12): Action->execute(Object(Registry))\n#2 /home/v/vegasd/printerstore.ru/public_html/vqmod/vqcache/vq2-system_modification_catalog_controller_product_manufacturer.php(654): Loader->controller('common /header')\n#3 /home/v/vegasd/printerstore.ru/public_html/vqmod/vqcache/vq2-system_modification_system_engine_action.php(65): ControllerProductManufacturer->info(Array)\n#4 /home/v/vegasd/printerstore.ru/public_html/system/engine/front.php(34 ): Action->execute(Object(Registry))\n#5 /home/v/vegasd/printerstore.ru/public_html/system/engine/front.php(29): Front->execute(Object(Actio in / home/v/vegasd/printerstore.ru/public_html/system/modification/catalog/controller/common/header.php on line 57en/public_html/system/modification/catalog/controller/common/header.php on line 57en/public_html/system/modification/catalog/controller/common/header.php on line 57
printerstore.ru [Thu Oct 25 16:21:54 2018] [error] [pid 40689] sapi_apache2.c(362): [client 66.102.9.142:49864] PHP Fatal error: Uncaught Error: Call to a member function getInformations( ) on null in /home/v/vegasd/printerstore.ru/public_html/system/modification/catalog/controller/common/header.php:57\nStack trace:\n#0 /home/v/vegasd/printerstore.ru /public_html/vqmod/vqcache/vq2-system_modification_system_engine_action.php(65): ControllerCommonHeader->index(Array)\n#1 12): Action->execute(Object(Registry))\n#2 /home/v/vegasd/printerstore.ru/public_html/vqmod/vqcache/vq2-system_modification_catalog_controller_product_manufacturer.php(654): Loader->controller('common /header')\n#3 /home/v/vegasd/printerstore.ru/public_html/vqmod/vqcache/vq2-system_modification_system_engine_action.php(65): ControllerProductManufacturer->info(Array)\n#4 /home/v/vegasd/printerstore.ru/public_html/system/engine/front.php(34 ): Action->execute(Object(Registry))\n#5 /home/v/vegasd/printerstore.ru/public_html/system/engine/front.php(29): Front->execute(Object(Actio in / home/v/vegasd/printerstore.ru/public_html/system/modification/catalog/controller/common/header.php on line 57en/public_html/system/modification/catalog/controller/common/header.php on line 57en/public_html/system/modification/catalog/controller/common/header.php on line 57
I understand that the error is: PHP Fatal error: Uncaught Error: Call to a member function getInformations()
how to fix it?

Answer 1

somewhere an object equal to null is substituted