Unexpected DB error occurred near:

Error After Major FUNC: add_update_counter_master_rec for rec_num: 2

--> set_rec_field_str called to set: "last_IP_addr" with value: {{3.233.239.20}}
--> set_rec_field_str called to set: "last_date" with value: {{1576450942}}
--> set_rec_field_str called to set: "S1" with value: {{1}}
--> set_rec_field_str called to set: "S2" with value: {{1576368000}}
--> set_rec_field_str called to set: "S3" with value: {{11}}
--> set_rec_field_str called to set: "S4" with value: {{1576281600}}
--> set_rec_field_str called to set: "S5" with value: {{}}
--> set_rec_field_str called to set: "S6" with value: {{1575763200}}
--> set_rec_field_str called to set: "S7" with value: {{}}
--> set_rec_field_str called to set: "S8" with value: {{1575158400}}
--> set_rec_field_str called to set: "S9" with value: {{}}
--> set_rec_field_str called to set: "S10" with value: {{1546300800}}
--> update_record called
*** get_db_error_msg called to return: Error from cbt level ***
===> ISAM error: Error from cbt level data file: Qfiles/Qcounters.db CBT error: key not found function: cbunlock context: finding leaf containing key ----> update_record function FAILED with error: Error from cbt level

DB Error= 1

Error Record's Field Contents:
2| I| 1| 199262| A| 3.233.239.20| 1576450942| 1| 1576368000| 11| 1576281600| | 1575763200| | 1575158400| | 1546300800| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |