diff --git a/packages/Parallel/Application/ParallelFileProcessor.php b/packages/Parallel/Application/ParallelFileProcessor.php
index c1e2d01d4d4..83d4ed2f971 100644
--- a/packages/Parallel/Application/ParallelFileProcessor.php
+++ b/packages/Parallel/Application/ParallelFileProcessor.php
@@ -74,6 +74,7 @@ public function process(
 
         // initial counters
         $fileDiffs = [];
+        /** @var SystemError[] $systemErrors */
         $systemErrors = [];
 
         $tcpServer = new TcpServer('127.0.0.1:0', $streamSelectLoop);
@@ -166,7 +167,7 @@ function (array $json) use (
                     // decode arrays to objects
                     foreach ($json[Bridge::SYSTEM_ERRORS] as $jsonError) {
                         if (is_string($jsonError)) {
-                            $systemErrors[] = 'System error: ' . $jsonError;
+                            $systemErrors[] = new SystemError('System error: ' . $jsonError);
                             continue;
                         }
 
@@ -211,7 +212,7 @@ function ($exitCode, string $stdErr) use (&$systemErrors, $processIdentifier): v
                         return;
                     }
 
-                    $systemErrors[] = 'Child process error: ' . $stdErr;
+                    $systemErrors[] = new SystemError('Child process error: ' . $stdErr);
                 }
             );
 
@@ -221,10 +222,10 @@ function ($exitCode, string $stdErr) use (&$systemErrors, $processIdentifier): v
         $streamSelectLoop->run();
 
         if ($reachedSystemErrorsCountLimit) {
-            $systemErrors[] = sprintf(
+            $systemErrors[] = new SystemError(sprintf(
                 'Reached system errors count limit of %d, exiting...',
                 self::SYSTEM_ERROR_COUNT_LIMIT
-            );
+            ));
         }
 
         return [
diff --git a/src/ValueObject/Error/SystemError.php b/src/ValueObject/Error/SystemError.php
index e2af17e904f..5a11c57bc69 100644
--- a/src/ValueObject/Error/SystemError.php
+++ b/src/ValueObject/Error/SystemError.php
@@ -11,7 +11,7 @@ final class SystemError implements SerializableInterface
 {
     public function __construct(
         private readonly string $message,
-        private readonly string $relativeFilePath,
+        private readonly string|null $relativeFilePath = null,
         private readonly int|null $line = null,
         private readonly string|null $rectorClass = null
     ) {
@@ -22,7 +22,7 @@ public function getMessage(): string
         return $this->message;
     }
 
-    public function getFile(): string
+    public function getFile(): string|null
     {
         return $this->relativeFilePath;
     }
@@ -38,7 +38,7 @@ public function getFileWithLine(): string
     }
 
     /**
-     * @return array{message: string, relative_file_path: string, line: int|null, rector_class: string|null}
+     * @return array{message: string, relative_file_path: string|null, line: int|null, rector_class: string|null}
      */
     public function jsonSerialize(): array
     {