Word 2016 Crashes when trying to insert new citation

Hi, 

I am having the same issue with only a single document crashing when I try to insert a citations. It has only just started doing it. I have 51 citations. I tried to follow the above link but it does not work. 

I tried to update citations and that also causes it to crash. 

Im using endnote x7.8. 

Any help would be much appreciated. 

Thanks Heaps