diff --git a/src/Commands/ExportRequestDocsCommand.php b/src/Commands/ExportRequestDocsCommand.php
index 9bef01f..8f20806 100644
--- a/src/Commands/ExportRequestDocsCommand.php
+++ b/src/Commands/ExportRequestDocsCommand.php
@@ -73,8 +73,8 @@ public function handle(): int
 
             // Loop and split Doc by the `methods` property.
             $docs = $this->laravelRequestDocs->splitByMethods($docs);
-            $docs = $this->laravelRequestDocs->sortDocs($docs, $this->option('sort') ?? 'default');
-            $docs = $this->laravelRequestDocs->groupDocs($docs, $this->option('groupby') ?? 'default');
+            $docs = $this->laravelRequestDocs->sortDocs($docs, is_string($this->option('sort')) ? $this->option('sort') : 'default');
+            $docs = $this->laravelRequestDocs->groupDocs($docs, is_string($this->option('groupby')) ? $this->option('groupby') : 'default');
 
             if (!$this->writeApiDocsToFile($docs)) {
                 throw new ErrorException("Failed to write on [{$this->exportFilePath}] file.");