diff --git a/lib/yaml-scraper.js b/lib/yaml-scraper.js
index f07ab2b..02b6fb4 100644
--- a/lib/yaml-scraper.js
+++ b/lib/yaml-scraper.js
@@ -53,10 +53,6 @@ const deleteParentRecursion = (obj, target) => {
         delete obj[key];
       } else if (typeof obj[key] === 'object') {
         deleteParentRecursion(obj[key], target);
-        if (Object.keys(obj[key]).length === 0) {
-          // eslint-disable-next-line no-param-reassign
-          delete obj[key];
-        }
       }
     });
 };
diff --git a/sample/sample-delete-deprecated-parent.yaml b/sample/sample-delete-deprecated-parent.yaml
index c630df2..285d463 100644
--- a/sample/sample-delete-deprecated-parent.yaml
+++ b/sample/sample-delete-deprecated-parent.yaml
@@ -3,9 +3,12 @@ info:
   description: sample
   title: sample
 paths:
+  '/rooms/{room-id}': {}
   '/rooms/{room-id}/doors':
     post:
       responses:
         '200':
           schema:
             type: object
+      security:
+        - api_key: []
diff --git a/sample/sample-delete-example.yaml b/sample/sample-delete-example.yaml
index cbf357e..1462fc1 100644
--- a/sample/sample-delete-example.yaml
+++ b/sample/sample-delete-example.yaml
@@ -21,6 +21,8 @@ paths:
                 type: integer
               comment:
                 type: string
+      security:
+        - api_key: []
   '/rooms/{room-id}/doors':
     get:
       deprecated: true
@@ -28,8 +30,12 @@ paths:
         '200':
           schema:
             type: array
+      security:
+        - api_key: []
     post:
       responses:
         '200':
           schema:
             type: object
+      security:
+        - api_key: []
diff --git a/sample/sample-empty-description.yaml b/sample/sample-empty-description.yaml
index f71b854..cb9254c 100644
--- a/sample/sample-empty-description.yaml
+++ b/sample/sample-empty-description.yaml
@@ -23,6 +23,8 @@ paths:
               comment:
                 type: string
                 example: 404
+      security:
+        - api_key: []
   '/rooms/{room-id}/doors':
     get:
       deprecated: true
@@ -30,8 +32,12 @@ paths:
         '200':
           schema:
             type: array
+      security:
+        - api_key: []
     post:
       responses:
         '200':
           schema:
             type: object
+      security:
+        - api_key: []
diff --git a/sample/sample-full.yaml b/sample/sample-full.yaml
index aa0d36a..79da30f 100644
--- a/sample/sample-full.yaml
+++ b/sample/sample-full.yaml
@@ -23,6 +23,8 @@ paths:
               comment:
                 type: string
                 example: 404
+      security:
+        - api_key: []
   '/rooms/{room-id}/doors':
     get:
       deprecated: true
@@ -30,8 +32,12 @@ paths:
         '200':
           schema:
             type: array
+      security:
+        - api_key: []
     post:
       responses:
         '200':
           schema:
             type: object
+      security:
+        - api_key: []