:call delimitMate#IsEmptyPair('><'), Key not present in Dictionary: 1.left_delims

[PegasusWang]

I use emmet-vim and when generate tag like this <button><button> and type <cr>, neovim shows:

Key not present in Dictionary: 1.left_delims

If I call delimitMate#IsEmptyPair directly, the same error occurs:

:call delimitMate#IsEmptyPair('><')

[d4em0n]

same issue