"An item with the same key already been added" only when using SDL language cloud with Trados 2017

Have you seen this before? Whenever I use SDL Language Cloud with Trados 2017, I get the warning "An item with the same key already been added" and I cannot proceed with the translation. Only through disabling this TM and starting again can I work. 

Is this common? How can I resolve this?

Your input is much appreciated!