SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'client_id' cannot be null

[SPEC-X67]

Hello sir
This restaurant webscript really helpful for me 😌
I am installed this script but showing a error 'client_id' cannot be null how can I fix this issue.. iam not programmer so i don't know how to fix 😁.
Sir please help me. I am hopefully waiting for your reply 😌

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'client_id' cannot be null
This is the error