Deploy Yii project with Docker&nginx

Hi,
in the past I used XAMPP for developing. In the last year I moved all my current laravel projects to a docker dev environment. I have an old YII project which need some tweaks from to time and I like to deploy this one with docker, too. At the moment I can’t get it working. I’m getting this YII error:

( ! ) Fatal error: Uncaught Error: Call to a member function getSystemViewPath() on bool in /app/public/phpRecDB/app/common/libs/yiiframework/base/CErrorHandler.php on line 390

Here is my setup:

docker-compose.yml

version: '3'
services:
  web:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/conf.d/nginx.conf
      - ./app:/app
    networks:
      - app-network
  php:
    build:
      context: .
      dockerfile: PHP.Dockerfile
    volumes:
      - ./app:/app
      - ./xdebug.ini:/usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
      - ./error_reporting.ini:/usr/local/etc/php/conf.d/error_reporting.ini
    environment:
      XDEBUG_ENABLED: 1
      XDEBUG_REMOTE_AUTOSTART: 1
      XDEBUG_MAXNESTING_LEVEL: 1000
      XDEBUG_REMOTE_CONNECT_BACK: 1
      XDEBUG_REMOTE_HOST: host.docker.internal
      PHP_IDE_CONFIG: serverName=localhost
    networks:
      - app-network
  mysql:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: 'secret'
      MYSQL_USER: 'testuser'
      MYSQL_PASSWORD: 'secret'
      MYSQL_DATABASE: 'testdb'
    volumes:
      - db_data:/var/lib/mysql
    ports:
      - 3306:3306
    networks:
      - app-network
networks:
  app-network:
    driver: bridge
volumes:
  db_data: {}

PHP.Dockerfile

FROM php:7.4-fpm

RUN docker-php-ext-install pdo pdo_mysql
RUN docker-php-ext-install mysqli
RUN pecl install xdebug && docker-php-ext-enable xdebug

nginx.conf

server {
    listen 80 default_server;
    root /app/public;

    index index.php index.html index.htm;

    location ~ \.php$ {
        fastcgi_pass php:9000;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

This error has nothing to do with docker. You are trying to call a function on a variable that contains a boolean instead of an object.

no it must be for sure something with the runtime envritonment (docker/nginx). this code is working on hundreds of websites (and in xampp dev environment) without any problem.

is there anybody who deployed a YII 1 proejct in docker and can share config settings?