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Update 5.7.13 to 8.5.2

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Hi
After few fixes to SQL table where was problem to drop some key I get this:
Doctrine \ ORM \ Internal \ Hydration \ HydrationException
The DQL alias 'r' contains an entity of an inheritance hierarchy with an empty discriminator value. This means that the database contains inconsistent data with an empty discriminator value in a table row.


I do not know where can I fix this.
onemhz