diff --git a/src/main/java/com/qdesrame/openapi/diff/output/ConsoleRender.java b/src/main/java/com/qdesrame/openapi/diff/output/ConsoleRender.java
index 7fe4d8a08..352e6df7b 100644
--- a/src/main/java/com/qdesrame/openapi/diff/output/ConsoleRender.java
+++ b/src/main/java/com/qdesrame/openapi/diff/output/ConsoleRender.java
@@ -234,7 +234,9 @@ protected Schema resolve(Schema schema) {
 
   protected String type(Schema schema) {
     String result = "object";
-    if (schema instanceof ArraySchema) {
+    if (schema == null) {
+      result = "no schema";
+    } else if (schema instanceof ArraySchema) {
       result = "array";
     } else if (schema.getType() != null) {
       result = schema.getType();
diff --git a/src/main/java/com/qdesrame/openapi/diff/output/HtmlRender.java b/src/main/java/com/qdesrame/openapi/diff/output/HtmlRender.java
index 756bc045a..9147c648c 100644
--- a/src/main/java/com/qdesrame/openapi/diff/output/HtmlRender.java
+++ b/src/main/java/com/qdesrame/openapi/diff/output/HtmlRender.java
@@ -288,7 +288,9 @@ protected Schema resolve(Schema schema) {
 
   protected String type(Schema schema) {
     String result = "object";
-    if (schema instanceof ArraySchema) {
+    if (schema == null) {
+      result = "no schema";
+    } else if (schema instanceof ArraySchema) {
       result = "array";
     } else if (schema.getType() != null) {
       result = schema.getType();
diff --git a/src/test/java/com/qdesrame/openapi/test/ResponseAddedContentSchemaTest.java b/src/test/java/com/qdesrame/openapi/test/ResponseAddedContentSchemaTest.java
new file mode 100644
index 000000000..66023c429
--- /dev/null
+++ b/src/test/java/com/qdesrame/openapi/test/ResponseAddedContentSchemaTest.java
@@ -0,0 +1,47 @@
+package com.qdesrame.openapi.test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.qdesrame.openapi.diff.OpenApiCompare;
+import com.qdesrame.openapi.diff.model.ChangedOpenApi;
+import com.qdesrame.openapi.diff.model.ChangedResponse;
+import com.qdesrame.openapi.diff.output.ConsoleRender;
+import com.qdesrame.openapi.diff.output.HtmlRender;
+import com.qdesrame.openapi.diff.output.MarkdownRender;
+import io.swagger.v3.oas.models.media.Content;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+public class ResponseAddedContentSchemaTest {
+
+  private final String OPENAPI_DOC1 = "response_schema_added_1.yaml";
+  private final String OPENAPI_DOC2 = "response_schema_added_2.yaml";
+
+  @Test
+  public void testDiffDifferent() {
+    ChangedOpenApi changedOpenApi = OpenApiCompare.fromLocations(OPENAPI_DOC1, OPENAPI_DOC2);
+
+    assertThat(changedOpenApi.getNewEndpoints()).isEmpty();
+    assertThat(changedOpenApi.getMissingEndpoints()).isEmpty();
+    assertThat(changedOpenApi.getChangedOperations()).isNotEmpty();
+
+    Map<String, ChangedResponse> changedResponses =
+        changedOpenApi.getChangedOperations().get(0).getApiResponses().getChanged();
+    assertThat(changedResponses).containsKey("200");
+
+    ChangedResponse changedResponse = changedResponses.get("200");
+    Content oldContent = changedResponse.getOldApiResponse().getContent();
+    Content newContent = changedResponse.getNewApiResponse().getContent();
+    assertThat(oldContent.get("application/json").getSchema()).isNull();
+    assertThat(newContent.get("application/json").getSchema()).isNotNull();
+  }
+
+  @Test
+  public void testDiffCanBeRendered() {
+    ChangedOpenApi changedOpenApi = OpenApiCompare.fromLocations(OPENAPI_DOC1, OPENAPI_DOC2);
+
+    assertThat(new ConsoleRender().render(changedOpenApi)).isNotBlank();
+    assertThat(new HtmlRender().render(changedOpenApi)).isNotBlank();
+    assertThat(new MarkdownRender().render(changedOpenApi)).isNotBlank();
+  }
+}
diff --git a/src/test/resources/response_schema_added_1.yaml b/src/test/resources/response_schema_added_1.yaml
new file mode 100644
index 000000000..d4050c576
--- /dev/null
+++ b/src/test/resources/response_schema_added_1.yaml
@@ -0,0 +1,106 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: listPets
+      tags:
+        - pets
+      parameters:
+        - name: limit
+          in: query
+          description: How many items to return at one time (max 100)
+          required: false
+          schema:
+            type: integer
+            format: int32
+      responses:
+        '200':
+          description: A paged array of pets
+          headers:
+            x-next:
+              description: A link to the next page of responses
+              schema:
+                type: string
+          content:
+            application/json: {}
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+    post:
+      summary: Create a pet
+      operationId: createPets
+      tags:
+        - pets
+      responses:
+        '201':
+          description: Null response
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+  /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+components:
+  schemas:
+    Pet:
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag:
+          type: string
+    Pets:
+      type: array
+      items:
+        $ref: "#/components/schemas/Pet"
+    Error:
+      required:
+        - code
+        - message
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string
diff --git a/src/test/resources/response_schema_added_2.yaml b/src/test/resources/response_schema_added_2.yaml
new file mode 100644
index 000000000..264dbeabf
--- /dev/null
+++ b/src/test/resources/response_schema_added_2.yaml
@@ -0,0 +1,109 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: listPets
+      tags:
+        - pets
+      parameters:
+        - name: limit
+          in: query
+          description: How many items to return at one time (max 100)
+          required: false
+          schema:
+            type: integer
+            format: int32
+      responses:
+        '200':
+          description: A paged array of pets
+          headers:
+            x-next:
+              description: A link to the next page of responses
+              schema:
+                type: string
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+    post:
+      summary: Create a pet
+      operationId: createPets
+      tags:
+        - pets
+      responses:
+        '201':
+          description: Null response
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+  /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+components:
+  schemas:
+    Pet:
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag:
+          type: string
+    Pets:
+      type: array
+      items:
+        $ref: "#/components/schemas/Pet"
+    Error:
+      required:
+        - code
+        - message
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string