4.2 Plugin SendinBlue error

Hello,
Upgrade of Nop 4.2 is very hard. Every plugin to be installed on Linux produce and error.
last error vas related to sendinblue Plugin, never installed before.
I receive an error during execution of below query:

SELECT TOP(1) [c].[Id], [c].[Active], [c].[AdminComment], [c].[AffiliateId], [c].[BillingAddress_Id], [c].[CannotLoginUntilDateUtc], [c].[CreatedOnUtc], [c].[CustomerGuid], [c].[Deleted], [c].[Email], [c].[EmailToRevalidate], [c].[FailedLoginAttempts], [c].[HasShoppingCartItems], [c].[IsSystemAccount], [c].[IsTaxExempt], [c].[LastActivityDateUtc], [c].[LastIpAddress], [c].[LastLoginDateUtc], [c].[RegisteredInStoreId], [c].[RequireReLogin], [c].[ShippingAddress_Id], [c].[SystemName], [c].[Username], [c].[VendorId]
FROM [Customer] AS [c]
WHERE [SystemName] = @__systemName_0
ORDER BY [c].[Id]

Checking on table SystemName is empty also in previous version 3.9.. which is the right value to be stored into Customer table?

Why is so diffcult all plugin: I had no any type of error during DB upgrade


Thanks in advance