diff --git a/src/main/java/ru/ip/labworks/labworks/bookshop/service/AuthorService.java b/src/main/java/ru/ip/labworks/labworks/bookshop/service/AuthorService.java
index fcffae2..9e0b4bb 100644
--- a/src/main/java/ru/ip/labworks/labworks/bookshop/service/AuthorService.java
+++ b/src/main/java/ru/ip/labworks/labworks/bookshop/service/AuthorService.java
@@ -107,7 +107,7 @@ public class AuthorService {
     @Transactional
     public void addBookToAuthor(Long id, Long bookId){
         Optional<Author> author = authorRepository.findById(id);
-        if (author.isPresent()){
+        if (author.isPresent() && !author.get().getBooks().contains(bookRepository.findById(bookId).get())){
             author.get().addBook(bookRepository.findById(bookId).get());
         }
         authorRepository.save(author.get());
@@ -116,7 +116,7 @@ public class AuthorService {
     @Transactional
     public void removeBookFromAuthor(Long id, Long bookId){
         Optional<Author> author = authorRepository.findById(id);
-        if(author.isPresent()){
+        if(author.isPresent() && author.get().getBooks().contains(bookRepository.findById(bookId).get())){
             author.get().removeBook(bookRepository.findById(bookId).get());
         }
         authorRepository.save(author.get());
diff --git a/src/main/java/ru/ip/labworks/labworks/bookshop/service/BookService.java b/src/main/java/ru/ip/labworks/labworks/bookshop/service/BookService.java
index 9a0d5e9..d95b607 100644
--- a/src/main/java/ru/ip/labworks/labworks/bookshop/service/BookService.java
+++ b/src/main/java/ru/ip/labworks/labworks/bookshop/service/BookService.java
@@ -112,7 +112,7 @@ public class BookService {
     @Transactional
     public void addGenreToBook(Long id, Long genreId){
         Optional<Book> book = bookRepository.findById(id);
-        if (book.isPresent()){
+        if (book.isPresent() && !book.get().getGenres().contains(genreRepository.findById(genreId).get())){
             book.get().addGenre(genreRepository.findById(genreId).get());
         }
         bookRepository.save(book.get());
@@ -121,7 +121,7 @@ public class BookService {
     @Transactional
     public void removeGenreFromBook(Long id, Long genreId){
         Optional<Book> book = bookRepository.findById(id);
-        if(book.isPresent()){
+        if(book.isPresent() && book.get().getGenres().contains(genreRepository.findById(genreId).get())){
             book.get().removeGenre(genreRepository.findById(genreId).get());
         }
         bookRepository.save(book.get());
diff --git a/src/main/resources/frontend/spa-vue/src/components/Header.vue b/src/main/resources/frontend/spa-vue/src/components/Header.vue
index 2a289e5..841fd56 100644
--- a/src/main/resources/frontend/spa-vue/src/components/Header.vue
+++ b/src/main/resources/frontend/spa-vue/src/components/Header.vue
@@ -11,8 +11,8 @@
                 <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
                     <div class="navbar-nav">
                         <a class="nav-link active" aria-current="page" href="/authors">Authors</a>
-                        <a class="nav-link" href="/books">Books</a>
-                        <a class="nav-link" href="/genres">Genres</a>
+                        <a class="nav-link active" href="/books">Books</a>
+                        <a class="nav-link active" href="/genres">Genres</a>
                     </div>
                 </div>
             </div>
diff --git a/src/main/resources/frontend/spa-vue/src/pages/Authors.vue b/src/main/resources/frontend/spa-vue/src/pages/Authors.vue
index bf2a223..502d54e 100644
--- a/src/main/resources/frontend/spa-vue/src/pages/Authors.vue
+++ b/src/main/resources/frontend/spa-vue/src/pages/Authors.vue
@@ -4,7 +4,6 @@ import axios from "axios";
 import Header from '../components/Header.vue';
 import Footer from '../components/Footer.vue';
 import Author from '../models/Author';
-import Book from '../models/Book';
 export default{
     components:{
         Header,
diff --git a/src/main/resources/frontend/spa-vue/src/pages/Index.vue b/src/main/resources/frontend/spa-vue/src/pages/Index.vue
index 081887e..7eae3d5 100644
--- a/src/main/resources/frontend/spa-vue/src/pages/Index.vue
+++ b/src/main/resources/frontend/spa-vue/src/pages/Index.vue
@@ -33,40 +33,6 @@ export default{
 
 <template>
     <Header></Header>
-    <main class="container" style="margin-top: 50pt;">
-        <div class="input-group mb-2 my-5">
-            <span class="input-group-text bg-primary text-white" id="basic-addon1"><strong>Действие:</strong></span>
-            <select class="form-select" aria-label="Default select example" v-model="action">
-                <option value="+">Plus(+)</option>
-                <option value="-">Minus(-)</option>
-                <option value="*">Multi(*)</option>
-                <option value=":">Div(\)</option>
-            </select>
-        </div>
-        <div class="input-group mb-2">
-            <span class="input-group-text bg-primary text-white" id="basic-addon1"><strong>Тип данных:</strong></span>
-            <select class="form-select" aria-label="Default select example" v-model="type">
-                <option value="int">Integer{}</option>
-                <option value="string">String"_"</option>
-                <option value="array">Array[]</option>
-            </select>
-        </div>
-        <div class="input-group mb-2">
-            <span class="input-group-text bg-primary text-white" id="basic-addon1"><strong>Аргумент№1:</strong></span>
-            <input type="text" class="form-control" placeholder="Введите превую строку" v-model="str_1">
-        </div>
-        <div class="input-group mb-2">
-            <span class="input-group-text bg-primary text-white" id="basic-addon1"><strong>Аргумент№2:</strong></span>
-            <input type="text" class="form-control" placeholder="Введите вторую строку" v-model="str_2">
-        </div>
-        <div class="input-group mb-2">
-            <span class="input-group-text bg-success text-white" id="basic-addon1"><strong>Вывод:</strong></span>
-            <input type="text" class="form-control" placeholder="Выводит рузультат здесь" v-model="result" readonly>
-        </div>
-        <div class="mb-2 d-flex justify-content-center">
-            <button type="submit" class="btn btn-success" @click.prevent="GetRepuest"><strong>GET</strong></button>
-        </div>
-    </main>
     <Footer></Footer>
 </template>