diff --git a/src/Collector/Stream/FilesystemStreamCollector.php b/src/Collector/Stream/FilesystemStreamCollector.php
index 0c567d86..699a5616 100644
--- a/src/Collector/Stream/FilesystemStreamCollector.php
+++ b/src/Collector/Stream/FilesystemStreamCollector.php
@@ -7,6 +7,8 @@
 use Yiisoft\Yii\Debug\Collector\CollectorTrait;
 use Yiisoft\Yii\Debug\Collector\SummaryCollectorInterface;
 
+use function count;
+
 final class FilesystemStreamCollector implements SummaryCollectorInterface
 {
     use CollectorTrait;
@@ -17,23 +19,25 @@ public function __construct(
          * Examples:
          * - '/' . preg_quote('yii-debug/src/Dumper', '/') . '/'
          * - '/ClosureExporter/'
+         *
+         * @var string[]
          */
         private readonly array $ignoredPathPatterns = [],
+        /**
+         * @var string[]
+         */
         private readonly array $ignoredClasses = [],
     ) {
     }
 
     /**
-     * @var array[]
+     * @psalm-var array<string, list<array{path: string, args: array}>>
      */
     private array $operations = [];
 
     public function getCollected(): array
     {
-        if (!$this->isActive()) {
-            return [];
-        }
-        return array_map('array_values', $this->operations);
+        return $this->isActive() ? $this->operations : [];
     }
 
     public function startup(): void
diff --git a/src/Collector/Stream/FilesystemStreamProxy.php b/src/Collector/Stream/FilesystemStreamProxy.php
index 51a71a66..528c9321 100644
--- a/src/Collector/Stream/FilesystemStreamProxy.php
+++ b/src/Collector/Stream/FilesystemStreamProxy.php
@@ -25,8 +25,20 @@ final class FilesystemStreamProxy implements StreamWrapperInterface
     public bool $ignored = false;
 
     public static ?FilesystemStreamCollector $collector = null;
+
+    /**
+     * @var string[]
+     */
     public static array $ignoredPathPatterns = [];
+
+    /**
+     * @var string[]
+     */
     public static array $ignoredClasses = [];
+
+    /**
+     * @psalm-var array<string, array{path: string, args: array}>
+     */
     public array $operations = [];
 
     public function __construct()
@@ -107,7 +119,7 @@ public function stream_read(int $count): string|false
     {
         if (!$this->ignored) {
             $this->operations['read'] = [
-                'path' => $this->decorated->filename,
+                'path' => $this->decorated->filename ?? '',
                 'args' => [],
             ];
         }
@@ -158,7 +170,7 @@ public function dir_readdir(): false|string
     {
         if (!$this->ignored) {
             $this->operations['readdir'] = [
-                'path' => $this->decorated->filename,
+                'path' => $this->decorated->filename ?? '',
                 'args' => [],
             ];
         }
@@ -239,7 +251,7 @@ public function stream_write(string $data): int
     {
         if (!$this->ignored) {
             $this->operations['write'] = [
-                'path' => $this->decorated->filename,
+                'path' => $this->decorated->filename ?? '',
                 'args' => [],
             ];
         }