donchian_channel NaN

[tg12]

I am getting a NaN on donchian_channel

I have upgraded all my python packages, I have a df with High and Low price. It runs fine just produces NaN

-----------------DEBUG-----------------
#################DEBUG#################
High Low Donchian_16
0 11970.1 11959.6 NaN
1 11963.6 11957.6 NaN
2 11961.5 11953.0 NaN
3 11955.0 11943.9 NaN
4 11949.1 11944.0 NaN
5 11950.1 11943.1 NaN
6 11943.8 11934.8 NaN
7 11943.1 11931.3 NaN
8 11932.9 11927.4 NaN
9 11935.9 11929.8 NaN
10 11935.9 11925.4 NaN
11 11938.5 11933.6 NaN
12 11941.4 11937.5 NaN
13 11941.8 11937.5 NaN
14 11941.9 11937.5 NaN
15 11941.7 11935.0 NaN