Unexpected DB error occurred near:

Error After Major FUNC: add_update_counter_master_rec for rec_num: 4

--> set_rec_field_str called to set: "last_IP_addr" with value: {{54.87.119.171}}
--> set_rec_field_str called to set: "last_date" with value: {{1480897615}}
--> set_rec_field_str called to set: "S1" with value: {{1}}
--> set_rec_field_str called to set: "S2" with value: {{1480809600}}
--> set_rec_field_str called to set: "S3" with value: {{11}}
--> set_rec_field_str called to set: "S4" with value: {{1480723200}}
--> set_rec_field_str called to set: "S5" with value: {{}}
--> set_rec_field_str called to set: "S6" with value: {{1480204800}}
--> set_rec_field_str called to set: "S7" with value: {{}}
--> set_rec_field_str called to set: "S8" with value: {{1480550400}}
--> set_rec_field_str called to set: "S9" with value: {{}}
--> set_rec_field_str called to set: "S10" with value: {{1451606400}}
--> 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:
4| I| 1| 62928| A| 54.87.119.171| 1480897615| 1| 1480809600| 11| 1480723200| | 1480204800| | 1480550400| | 1451606400| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |