Unexpected DB error occurred near:

Error After Major FUNC: add_update_counter_master_rec for rec_num: PL1309368495

--> set_rec_field_str called to set: "last_IP_addr" with value: {{54.146.50.80}}
--> set_rec_field_str called to set: "last_date" with value: {{1511320669}}
--> set_rec_field_str called to set: "S1" with value: {{1}}
--> set_rec_field_str called to set: "S2" with value: {{1511308800}}
--> set_rec_field_str called to set: "S3" with value: {{24}}
--> set_rec_field_str called to set: "S4" with value: {{1511222400}}
--> set_rec_field_str called to set: "S5" with value: {{}}
--> set_rec_field_str called to set: "S6" with value: {{1510704000}}
--> set_rec_field_str called to set: "S7" with value: {{}}
--> set_rec_field_str called to set: "S8" with value: {{1509494400}}
--> set_rec_field_str called to set: "S9" with value: {{}}
--> set_rec_field_str called to set: "S10" with value: {{1483228800}}
--> 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:
PL1309368495| I| 1| 17923| A| 54.146.50.80| 1511320669| 1| 1511308800| 24| 1511222400| | 1510704000| | 1509494400| | 1483228800| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |