Ghost Term in Multiterm 2017 blocking everything

Hi,
I'm encountering an issue in the Term Recognition Window in Studio 2017: one term seems to be blocking everything everytime it occurs. I'd like to delete it, but there is my problem: I cannot select it for modification/suppression neither from the Term Recognition/Term Details Window in Studio, nor in Multiterm itself. It is some kind of "ghost" term, appearing without really being there. Is there any other solution to edit my data base or am I to export it to Excel with Glossary Converter and retreat the file?
Regards, Caroline