diff --git a/src/main/java/io/spring/api/exception/CustomizeExceptionHandler.java b/src/main/java/io/spring/api/exception/CustomizeExceptionHandler.java
index ade3ff4ff..71c706846 100644
--- a/src/main/java/io/spring/api/exception/CustomizeExceptionHandler.java
+++ b/src/main/java/io/spring/api/exception/CustomizeExceptionHandler.java
@@ -59,6 +59,18 @@ public ResponseEntity<Object> handleInvalidAuthentication(
             });
   }
 
+  @ExceptionHandler(ResourceNotFoundException.class)
+  public ResponseEntity<Object> handleResourceNotFound(
+      ResourceNotFoundException e, WebRequest request) {
+    return ResponseEntity.status(HttpStatus.NOT_FOUND)
+        .body(
+            new HashMap<String, Object>() {
+              {
+                put("message", "Resource not found");
+              }
+            });
+  }
+
   @Override
   protected ResponseEntity<Object> handleMethodArgumentNotValid(
       MethodArgumentNotValidException e,
diff --git a/src/main/java/io/spring/graphql/exception/GraphQLCustomizeExceptionHandler.java b/src/main/java/io/spring/graphql/exception/GraphQLCustomizeExceptionHandler.java
index bf4768b3b..a60dc1b69 100644
--- a/src/main/java/io/spring/graphql/exception/GraphQLCustomizeExceptionHandler.java
+++ b/src/main/java/io/spring/graphql/exception/GraphQLCustomizeExceptionHandler.java
@@ -9,6 +9,7 @@
 import graphql.execution.DataFetcherExceptionHandlerResult;
 import io.spring.api.exception.FieldErrorResource;
 import io.spring.api.exception.InvalidAuthenticationException;
+import io.spring.api.exception.ResourceNotFoundException;
 import io.spring.graphql.types.Error;
 import io.spring.graphql.types.ErrorItem;
 import java.util.ArrayList;
@@ -62,6 +63,14 @@ public DataFetcherExceptionHandlerResult onException(
               .extensions(errorsToMap(errors))
               .build();
       return DataFetcherExceptionHandlerResult.newResult().error(graphqlError).build();
+    } else if (handlerParameters.getException() instanceof ResourceNotFoundException) {
+      GraphQLError graphqlError =
+          TypedGraphQLError.newBuilder()
+              .errorType(ErrorType.NOT_FOUND)
+              .message("Resource not found")
+              .path(handlerParameters.getPath())
+              .build();
+      return DataFetcherExceptionHandlerResult.newResult().error(graphqlError).build();
     } else {
       return defaultHandler.onException(handlerParameters);
     }
diff --git a/src/test/java/io/spring/api/ProfileApiTest.java b/src/test/java/io/spring/api/ProfileApiTest.java
index f32091ecd..1d68c8b65 100644
--- a/src/test/java/io/spring/api/ProfileApiTest.java
+++ b/src/test/java/io/spring/api/ProfileApiTest.java
@@ -93,4 +93,42 @@ public void should_unfollow_user_success() throws Exception {
 
     verify(userRepository).removeRelation(eq(followRelation));
   }
+
+  @Test
+  public void should_get_404_when_profile_not_found() throws Exception {
+    when(profileQueryService.findByUsername(eq("nonexistent"), eq(null)))
+        .thenReturn(Optional.empty());
+    RestAssuredMockMvc.when()
+        .get("/profiles/{username}", "nonexistent")
+        .prettyPeek()
+        .then()
+        .statusCode(404)
+        .body("message", equalTo("Resource not found"));
+  }
+
+  @Test
+  public void should_get_404_when_follow_nonexistent_user() throws Exception {
+    when(userRepository.findByUsername(eq("nonexistent"))).thenReturn(Optional.empty());
+    given()
+        .header("Authorization", "Token " + token)
+        .when()
+        .post("/profiles/{username}/follow", "nonexistent")
+        .prettyPeek()
+        .then()
+        .statusCode(404)
+        .body("message", equalTo("Resource not found"));
+  }
+
+  @Test
+  public void should_get_404_when_unfollow_nonexistent_user() throws Exception {
+    when(userRepository.findByUsername(eq("nonexistent"))).thenReturn(Optional.empty());
+    given()
+        .header("Authorization", "Token " + token)
+        .when()
+        .delete("/profiles/{username}/follow", "nonexistent")
+        .prettyPeek()
+        .then()
+        .statusCode(404)
+        .body("message", equalTo("Resource not found"));
+  }
 }