Text field issue switching from scene to another scene

Hi Guys,

i have created two scenes in my game. One is called "StartScene" and one "CreatePlayerScene". There is a text field in the last one which works perfectly if i start the scene directly from the editor. But if i switch from StartScene to CreatePlayerScene by pressing space the text field stop working and i get this error:

NullReferenceException: Object reference not set to an instance of an object UnityEngine.TextEditor.ClampPos () (at C:/BuildAgent/work/d63dfc6385190b60/Runtime/Export/TextEditor.cs:1251) UnityEngine.GUI.DoTextField (Rect position, Int32 id, UnityEngine.GUIContent content, Boolean multiline, Int32 maxLength, UnityEngine.GUIStyle style) (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/GUI.cs:550) UnityEngine.GUI.TextField (Rect position, System.String text) (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/GUI.cs:440) MenuScript.OnGUI () (at Assets/Scripts/MenuScript.cs:41)

Why?

Here's the part of the code where i use the text field.

     void OnGUI ()
     {
         GUI.skin = myGuiSkin;
 
         if(!showTextField)
         {
             if(GUI.Button (new Rect(Screen.width/2f - Screen.width*0.1f, Screen.height/2f, 500, 100), "New Game"))
             {
                 showTextField = true;
             }
         }
 
         if(showTextField)
         {
             playerName = GUI.TextField(new Rect(Screen.width/2f - Screen.width*0.1f, Screen.height/2f, 500, 50), playerName);
             PlayerPrefs.SetString("playerName", playerName);
         }
 
     }