This can be a common plugin error and it's hard to determine its exact cause.
However, if the error is not caused by the plugin, then this error may be related to the fact that the data entered does not conform to the business rules, or that the data is null.
I suggest you check your plugins or customizations (business rule / workflow / JS form event).
If my answer was helpful, please click Like, and if it solved your problem, I hope you can verify it to help other community members find more. Please feel free to contact me if you have any further questions. Regards, Haig
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