diff --git a/module/Common/functions/functions.php b/module/Common/functions/functions.php
index e28e4fb2..b2c5d307 100644
--- a/module/Common/functions/functions.php
+++ b/module/Common/functions/functions.php
@@ -4,8 +4,11 @@ declare(strict_types=1);
 namespace Shlinkio\Shlink\Common;
 
 use const JSON_ERROR_NONE;
+use function array_key_exists;
+use function array_shift;
 use function getenv;
 use function in_array;
+use function is_array;
 use function json_last_error;
 use function json_last_error_msg;
 use function strtolower;
@@ -59,3 +62,39 @@ function json_decode(string $json, int $depth = 512, int $options = 0): array
 
     return $data;
 }
+
+function array_path_exists(array $path, array $array): bool
+{
+    // As soon as a step is not found, the path does not exist
+    $step = array_shift($path);
+    if (! array_key_exists($step, $array)) {
+        return false;
+    }
+
+    // Once the path is empty, we have found all the parts in the path
+    if (empty($path)) {
+        return true;
+    }
+
+    // If current value is not an array, then we have not found the path
+    $newArray = $array[$step];
+    if (! is_array($newArray)) {
+        return false;
+    }
+
+    return array_path_exists($path, $newArray);
+}
+
+function array_get_path(array $path, array $array)
+{
+    do {
+        $step = array_shift($path);
+        if (! is_array($array) || ! array_key_exists($step, $array)) {
+            return null;
+        }
+
+        $array = $array[$step];
+    } while (! empty($path));
+
+    return $array;
+}
diff --git a/module/Installer/src/Model/CustomizableAppConfig.php b/module/Installer/src/Model/CustomizableAppConfig.php
index 27a7dcd0..94da5ec4 100644
--- a/module/Installer/src/Model/CustomizableAppConfig.php
+++ b/module/Installer/src/Model/CustomizableAppConfig.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 namespace Shlinkio\Shlink\Installer\Model;
 
 use Zend\Stdlib\ArraySerializableInterface;
+use function Shlinkio\Shlink\Common\array_get_path;
+use function Shlinkio\Shlink\Common\array_path_exists;
 
 final class CustomizableAppConfig implements ArraySerializableInterface
 {
@@ -112,43 +114,43 @@ final class CustomizableAppConfig implements ArraySerializableInterface
 
     public function exchangeArray(array $array): void
     {
-        $this->setApp([
-            'SECRET' => $array['app_options']['secret_key'] ?? null,
-            'DISABLE_TRACK_PARAM' => $array['app_options']['disable_track_param'] ?? null,
-        ]);
+        $this->setApp($this->mapExistingPathsToKeys([
+            'SECRET' => ['app_options', 'secret_key'],
+            'DISABLE_TRACK_PARAM' => ['app_options', 'disable_track_param'],
+        ], $array));
 
-        $this->setDatabase($this->deserializeDatabase($array['entity_manager']['connection'] ?? []));
+        $this->setDatabase($this->mapExistingPathsToKeys([
+            'DRIVER' => ['entity_manager', 'connection', 'driver'],
+            'USER' => ['entity_manager', 'connection', 'user'],
+            'PASSWORD' => ['entity_manager', 'connection', 'password'],
+            'NAME' => ['entity_manager', 'connection', 'dbname'],
+            'HOST' => ['entity_manager', 'connection', 'host'],
+            'PORT' => ['entity_manager', 'connection', 'port'],
+        ], $array));
 
-        $this->setLanguage([
-            'DEFAULT' => $array['translator']['locale'] ?? null,
-            'CLI' => $array['cli']['locale'] ?? null,
-        ]);
+        $this->setLanguage($this->mapExistingPathsToKeys([
+            'DEFAULT' => ['translator', 'locale'],
+            'CLI' => ['cli', 'locale'],
+        ], $array));
 
-        $this->setUrlShortener([
-            'SCHEMA' => $array['url_shortener']['domain']['schema'] ?? null,
-            'HOSTNAME' => $array['url_shortener']['domain']['hostname'] ?? null,
-            'CHARS' => $array['url_shortener']['shortcode_chars'] ?? null,
-            'VALIDATE_URL' => $array['url_shortener']['validate_url'] ?? true,
-        ]);
+        $this->setUrlShortener($this->mapExistingPathsToKeys([
+            'SCHEMA' => ['url_shortener', 'domain', 'schema'],
+            'HOSTNAME' => ['url_shortener', 'domain', 'hostname'],
+            'CHARS' => ['url_shortener', 'shortcode_chars'],
+            'VALIDATE_URL' => ['url_shortener', 'validate_url'],
+        ], $array));
     }
 
-    private function deserializeDatabase(array $conn): array
+    private function mapExistingPathsToKeys(array $map, array $config): array
     {
-        if (! isset($conn['driver'])) {
-            return [];
-        }
-        $driver = $conn['driver'];
-
-        $params = ['DRIVER' => $driver];
-        if ($driver !== 'pdo_sqlite') {
-            $params['USER'] = $conn['user'] ?? null;
-            $params['PASSWORD'] = $conn['password'] ?? null;
-            $params['NAME'] = $conn['dbname'] ?? null;
-            $params['HOST'] = $conn['host'] ?? null;
-            $params['PORT'] = $conn['port'] ?? null;
+        $result = [];
+        foreach ($map as $key => $path) {
+            if (array_path_exists($path, $config)) {
+                $result[$key] = array_get_path($path, $config);
+            }
         }
 
-        return $params;
+        return $result;
     }
 
     public function getArrayCopy(): array
diff --git a/module/Installer/test/ConfigProviderTest.php b/module/Installer/test/ConfigProviderTest.php
new file mode 100644
index 00000000..a75a5fe0
--- /dev/null
+++ b/module/Installer/test/ConfigProviderTest.php
@@ -0,0 +1,29 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\Installer;
+
+use PHPUnit\Framework\TestCase;
+use Shlinkio\Shlink\Installer\ConfigProvider;
+
+class ConfigProviderTest extends TestCase
+{
+    /**
+     * @var ConfigProvider
+     */
+    protected $configProvider;
+
+    public function setUp()
+    {
+        $this->configProvider = new ConfigProvider();
+    }
+
+    /**
+     * @test
+     */
+    public function configIsReturned()
+    {
+        $config = $this->configProvider->__invoke();
+        $this->assertEmpty($config);
+    }
+}
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index f9f7797b..199b49bb 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -24,10 +24,7 @@
 
     <filter>
         <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./module/Common/src</directory>
-            <directory suffix=".php">./module/Core/src</directory>
-            <directory suffix=".php">./module/Rest/src</directory>
-            <directory suffix=".php">./module/CLI/src</directory>
+            <directory suffix=".php">./module/*/src</directory>
 
             <exclude>
                 <directory suffix=".php">./module/Core/src/Repository</directory>