Exception validation user defined fields

[dleadbetter]

An error occurs when attempting to save a record without entering a value for a required user defined field:

12:42:54 PM api.1 |  Completed 500 Internal Server Error in 32ms (ActiveRecord: 2.7ms | Allocations: 5524)
12:42:54 PM api.1 |  TypeError (no implicit conversion of Hash into String):
12:42:54 PM api.1 |  /Users/dleadbetter/.rbenv/versions/3.1.1/lib/ruby/3.1.0/json/common.rb:216:in `initialize'
12:42:54 PM api.1 |  /Users/dleadbetter/.rbenv/versions/3.1.1/lib/ruby/3.1.0/json/common.rb:216:in `new'
12:42:54 PM api.1 |  /Users/dleadbetter/.rbenv/versions/3.1.1/lib/ruby/3.1.0/json/common.rb:216:in `parse'
12:42:54 PM api.1 |  user-defined-fields (4fff0bdfaad7) app/models/concerns/user_defined_fields/fieldable.rb:46:in `block in validate_user_defined_fields'
12:42:54 PM api.1 |  activerecord (7.0.2.4) lib/active_record/relation/delegation.rb:88:in `each'
12:42:54 PM api.1 |  activerecord (7.0.2.4) lib/active_record/relation/delegation.rb:88:in `each'
12:42:54 PM api.1 |  user-defined-fields (4fff0bdfaad7) app/models/concerns/user_defined_fields/fieldable.rb:41:in `validate_user_defined_fields'