ashishnetworks

yes your solution worked Ale thanks. ??

exactly same problem is happening to me with word press version 4.4. What actually happening here is that after saving newly created menu. If suppose I later try to edit or add new menu item to existing menu I cant see the existing menu items in menu list. They still exist in database as I can see them in user end but I cant edit them as they are no more visible

See Img Here : https://imgur.com/VlSwBkl

I had around 350 Entries in my tables and I was having exactly same error. After reading your comments about possibly shortage of memory on server as cause for the error I thought to delete few unimportant rows entries (May be 10 or 12 I deleted) and then I tried to save table again.. and wolla !! It saved successfully