diff --git a/src/service.spec.ts b/src/service.spec.ts
index d7126ba..c259a02 100644
--- a/src/service.spec.ts
+++ b/src/service.spec.ts
@@ -19,6 +19,7 @@ import { SourceType } from './document';
 import { IDocumentData } from './interfaces/document';
 import { DocumentCollection } from './document-collection';
 import { ClonedResource } from './cloned-resource';
+import arrayContaining = jasmine.arrayContaining;
 
 // @todo disable PhotoService
 // @TODO: fix error in toObject when relationship's service is not injected
@@ -1318,3 +1319,43 @@ describe('service.get()', () => {
         expect(book_clone.relationships.author.loaded).toBe(original_book.relationships.author.loaded);
     });
 });
+
+describe('service.delete()', () => {
+    let core: Core;
+    let authorsService: AuthorsService;
+    let booksService: BooksService;
+    beforeEach(async () => {
+        core = new Core(new JsonapiConfig(), new JsonapiHttpImported(new HttpClient(new HttpHandlerMock()), new JsonapiConfig()), injector);
+        authorsService = new AuthorsService();
+        authorsService.register();
+        booksService = new BooksService();
+        booksService.register();
+        await authorsService.clearCache();
+        await booksService.clearCache();
+        test_response_subject.complete();
+        test_response_subject = new BehaviorSubject(new HttpResponse());
+    });
+
+    it(`.delete() for relationship does not remove entities from parent's .all()`, async () => {
+        // given
+        test_response_subject.next(new HttpResponse({ body: TestFactory.getCollectionDocumentData(Author) }));
+        let authors = await authorsService.all({ include: ['books'] }).toPromise();
+        test_response_subject.complete();
+
+        let author1 = authors.data[0];
+        let book = author1.relationships.books.data[0];
+        let author2 = authors.data[1];
+
+        expect(author2).toBeTruthy();
+        expect(authors.data).toEqual(arrayContaining([author1, author2]));
+
+        // when
+        test_response_subject = new BehaviorSubject(new HttpResponse());
+        test_response_subject.next(new HttpResponse());
+        await booksService.delete(book.id).toPromise();
+        test_response_subject.complete();
+
+        // then
+        expect(authors.data).toEqual(arrayContaining([author1, author2]));
+    });
+});
diff --git a/src/services/cachememory.ts b/src/services/cachememory.ts
index 4bf490b..114bb8d 100644
--- a/src/services/cachememory.ts
+++ b/src/services/cachememory.ts
@@ -111,12 +111,13 @@ export class CacheMemory<R extends Resource = Resource> {
             return;
         }
         Base.forEach(this.collections, (value, url) => {
-            value.data.splice(
-                value.data.findIndex(
-                    (resource_on_collection: Resource) => resource_on_collection.type === type && resource_on_collection.id === id
-                ),
-                1
+            const idx = value.data.findIndex(
+                (resource_on_collection: Resource) => resource_on_collection.type === type && resource_on_collection.id === id
             );
+
+            if (idx !== -1) {
+                value.data.splice(idx, 1);
+            }
         });
         resource.attributes = {}; // just for confirm deletion on view