Comment 12 for bug 937605

I have the same problem.
I was able to isolate the cause in my vimrc:

if &filetype != 'tex'
  imap <M-C-J> <Plug>IMAP_JumpForward
  nmap <M-C-J> <Plug>IMAP_JumpForward
  vmap <M-C-J> <Plug>IMAP_JumpForward
  vmap <M-C-J> <Plug>IMAP_DeleteAndJumpForward
endif

if I comment these lines then the plugin doesn't give an error.