diff --git a/src/library/BookFieldPattern.form b/src/library/BookFieldPattern.form
index ebdd0e5..cdaa58b 100644
--- a/src/library/BookFieldPattern.form
+++ b/src/library/BookFieldPattern.form
@@ -142,6 +142,7 @@
       </Events>
       <AuxValues>
         <AuxValue name="JavaCodeGenerator_SerializeTo" type="java.lang.String" value="BookFieldPattern_bookTitle"/>
+        <AuxValue name="JavaCodeGenerator_VariableModifier" type="java.lang.Integer" value="0"/>
       </AuxValues>
     </Component>
     <Component class="javax.swing.JLabel" name="authorname">
diff --git a/src/library/BookFieldPattern.java b/src/library/BookFieldPattern.java
index 6aa0c1f..32a3e08 100644
--- a/src/library/BookFieldPattern.java
+++ b/src/library/BookFieldPattern.java
@@ -32,7 +32,12 @@ public class BookFieldPattern extends javax.swing.JFrame {
     public BookFieldPattern(boolean required) {
         initComponents();
         this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
-        //bookTitle.setInputVerifier(new library.Validation("[a-zA-z0-9]+", required));
+        bookTitle.setInputVerifier(verify);
+        authorName.setInputVerifier(verify);
+        authorSurname.setInputVerifier(verify);
+        year.setInputVerifier(verify);
+        ISBN.setInputVerifier(verify);
+        publishing.setInputVerifier(verify);
     }
 
     public boolean add = false, delete = false, edit = false, search = false;
@@ -344,7 +349,7 @@ public class BookFieldPattern extends javax.swing.JFrame {
     private javax.swing.JTextField authorSurname;
     private javax.swing.JLabel authorname;
     private javax.swing.JLabel authorsurname;
-    private javax.swing.JTextField bookTitle;
+    javax.swing.JTextField bookTitle;
     private javax.swing.JButton cancel;
     private javax.swing.JLabel jLabel1;
     private javax.swing.JLabel lISBN;
diff --git a/src/library/Validation.java b/src/library/Validation.java
index 97e7807..a072729 100644
--- a/src/library/Validation.java
+++ b/src/library/Validation.java
@@ -31,39 +31,40 @@ public class Validation extends InputVerifier {
 
     public boolean checkField(JComponent input) {
         JTextField tf = (JTextField) input;
-        if(required){
-            if("".equals(tf.getText())){
+        if (required) {
+            if ((tf.getText().equals(""))) {
                 JOptionPane.showMessageDialog(null, "Pole wymagane!", "Błąd wprowadzanych danych", JOptionPane.INFORMATION_MESSAGE);
-                    return false;
+                return false;
             }
         }
-        if (input.getName().equals("year")) {
-            
-            if (!"".equals(tf.getText())) {
-                try {
-                    year = Integer.parseInt(tf.getText());
-                    if (year > 2016 || year < 1900) {
-                        JOptionPane.showMessageDialog(null, "Data spoza zakresu.", "Błąd wprowadzanych danych", JOptionPane.INFORMATION_MESSAGE);
+        if (input.getName() != null){
+            if (input.getName().equals("year")) {
+                if (!"".equals(tf.getText())) {
+                    try {
+                        year = Integer.parseInt(tf.getText());
+                        if (year > 2016 || year < 1900) {
+                            JOptionPane.showMessageDialog(null, "Data spoza zakresu.", "Błąd wprowadzanych danych", JOptionPane.INFORMATION_MESSAGE);
+                            return false;
+                        }
+                    } catch (NumberFormatException e) {
+                        JOptionPane.showMessageDialog(null, "Wpisz datę w formacie: YYYY", "Błąd wprowadzanych danych", JOptionPane.INFORMATION_MESSAGE);
                         return false;
                     }
-                } catch (NumberFormatException e) {
-                    JOptionPane.showMessageDialog(null, "Wpisz datę w formacie: YYYY", "Błąd wprowadzanych danych", JOptionPane.INFORMATION_MESSAGE);
-                    return false;
                 }
             }
-        }
-        if (input.getName().equals("isbn")) {
-            if (!"".equals(tf.getText())) {
-                Pattern p = Pattern.compile("[0-9][0-9][0-9]-[0-9]-[0-9][0-9][0-9][0-9]-[0-9]");
-                Matcher m = p.matcher(tf.getText());
-                if (m.matches()) {
-                    return true;
-                } else {
-                    JOptionPane.showMessageDialog(null, "Niepoprawne dane!", "Sprawdzenie pola:", JOptionPane.INFORMATION_MESSAGE);
-                    return false;
+            if (input.getName().equals("isbn")) {
+                if (!"".equals(tf.getText())) {
+                    Pattern p = Pattern.compile("[0-9][0-9][0-9]-[0-9]-[0-9][0-9][0-9][0-9]-[0-9]");
+                    Matcher m = p.matcher(tf.getText());
+                    if (m.matches()) {
+                        return true;
+                    } else {
+                        JOptionPane.showMessageDialog(null, "Niepoprawne dane!", "Sprawdzenie pola:", JOptionPane.INFORMATION_MESSAGE);
+                        return false;
+                    }
                 }
+                return true;
             }
-            return true;
         }
 
         return true;