Exporting a dashboard to PDF, why do my panels show "Error in 'SearchParser': Missing a search command before '|'. Error at position '749' of search query '[My query]'" in the PDF?

Hi! The Dashboard is entirely done and I can see my results. I want to Export to PDF, and in the PDF, instead of my first 2 panels, I have the same error for both of the panels : Error in 'SearchParser': Missing a search command before '|'. Error at position '749' of search query '[My query]' And of course there is no result for these two panels... I Have already checked the queries, and no error, any ideas? Thanks !