[mysql] ERROR 1452: Cannot add or update a child row: a foreign key constraint fails

I am having the same issue here is my scenario

i put empty('') where value is NULL now this '' value does not match with the parent table's id

here is things need to check , all value with presented in parent table otherwise remove data from parent table then try enter image description here

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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails MySQL - Cannot add or update a child row: a foreign key constraint fails Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails