What happened when the trademark reexamination didn't receive the reexamination decision, but the trademark was invalid

I am the trademark agent of Shenzhen Wei Expo Intellectual Property Agency, and the applicant He Lifen entrusted me to represent the trademark No.11815859, and received the rejection notice from the Trademark Office in December 213. The applicant entrusted us to reexamine the trademark for the reasons of rejection, and received the Trademark Review and Adjudication Board in March 213. But now the trademark No.11815859 is invalid. What's the matter? The Trademark Review and Adjudication Board invalidated the trademark without notifying the agent, which caused the applicant to lose the opportunity to sue. How should this situation be handled?

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