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: {{23.20.184.141}}
--> set_rec_field_str called to set: "last_date" with value: {{1472027884}}
--> set_rec_field_str called to set: "S1" with value: {{1}}
--> set_rec_field_str called to set: "S2" with value: {{1471996800}}
--> set_rec_field_str called to set: "S3" with value: {{11}}
--> set_rec_field_str called to set: "S4" with value: {{1471910400}}
--> set_rec_field_str called to set: "S5" with value: {{}}
--> set_rec_field_str called to set: "S6" with value: {{1471392000}}
--> set_rec_field_str called to set: "S7" with value: {{}}
--> set_rec_field_str called to set: "S8" with value: {{1470009600}}
--> 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| 23.20.184.141| 1472027884| 1| 1471996800| 11| 1471910400| | 1471392000| | 1470009600| | 1451606400| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |