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FK error con cadena vacía

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Absolute service time: 0,38 sec, absolute service time: 0,38 sec 
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Error(s), warning(s):
Cannot add or update a child row: a foreign key constraint fails (`rextester`.`sstan_hijo`, CONSTRAINT `sstan_hijo_ibfk_1` FOREIGN KEY (`padre_id`) REFERENCES `sstan_padre` (`padre_id`))