InvalidOperationException with MediaLibrary pictures

I have a windows phone app and get sometimes InvalidOperationExceptions but not sure why and how to avoid them. The problem function from the error report is Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].get_Item and i get this stacktrace

"Frame    Image                             Function                                                                                                                                    Offset        
0        Microsoft.Xna.Framework.ni.dll    Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].get_Item                                                 0x0003e4d8    
1        Microsoft.Xna.Framework.ni.dll    Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].System.Collections.IEnumerator.get_Current               0x00000006    
2        Microsoft.Xna.Framework.ni.dll    Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].System.Collections.Generic.IEnumerator_T_.get_Current    0x0000001c    
3        MapLense.ni.DLL                   MapLense.Helper.PictureMapping.Add                                                                                                          0x000000a8    
4        MapLense.ni.DLL                   MapLense.Helper.PictureMapping+_GetPicture_d__b.MoveNext                                                                                    0x000000f6    
5        mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess                                                                              0x00216c46    
6        mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification                                                         0x0000003a    
7        mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter_1[[System.__Canon,_mscorlib]].GetResult                                                         0x0000001c    
8        MapLense.ni.DLL                   MapLense.Helper.Map+_AddPictureToMap_d__17.MoveNext                                                                                         0x00000118    
9        mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess                                                                              0x00216c46    
10       mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification                                                         0x0000003a    
11       mscorlib.ni.dll                   System.Runtime.CompilerServices.TaskAwaiter_1[[System.__Canon,_mscorlib]].GetResult                                                         0x0000001c    
12       MapLense.ni.DLL                   MapLense.MainPage+_ViewModelOnPropertyChanged_d__1e.MoveNext                                                                                0x00000204    
13       mscorlib.ni.dll                   System.Runtime.CompilerServices.AsyncMethodBuilderCore._ThrowAsync_b__0                                                                     0x00000036"

I also tried to add a try-catch block around the code block, but without a result

public static bool Add(DBPicture dbpicture)
{
    if (Pictures.ContainsKey(dbpicture.UniqueID))
        return true;

    var root = new MediaLibrary().RootPictureAlbum;

    foreach (var album in root.Albums)
    {
        if (album.Name != AppResources.CameraRollAlbumName) continue;

        for (var i = 0; i < album.Pictures.Count; i++)
        {
            try
            {
                var picture = album.Pictures[i];
                if (picture.Name == dbpicture.UniqueID)
                {
                    Pictures.Add(picture.Name, picture);
                    DBPictures.Add(picture.Name, dbpicture);
                    return true;
                }
            }
            catch (System.Exception e)
            {
#if DEBUG
                Logger.WriteLine("PictureMapping.Add(DBPicture)");
                Logger.WriteLine(e);
#endif
            }
        }
    }

    return false;
}

Thanks for any suggestions

Not really one answer but if the error is one the first foreach and the try is on the second it's not catching the exception put the try outside the

try
{
    var root = new MediaLibrary().RootPictureAlbum;