Failed to release OCSP ssl-stapling lock

Hello! This night Apache's error_log is full of stapling lock warnings. The events started around 01:06:06 AM. [QUOTE][ssl:warn] [pid 24652:tid 140649097520896] (43)Identifier removed: AH01949: Failed to release OCSP ssl-stapling lock
Apache is working on 80/443 port. Do I need to take it seriously? How to diagnose? Thanks!