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-rw-r--r--activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb b/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
index 1ca448236e..198ad06360 100644
--- a/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
+++ b/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
@@ -19,7 +19,7 @@ module ActiveRecord
def klass
type = owner[reflection.foreign_type]
- type && type.constantize
+ type.presence && type.constantize
end
def raise_on_type_mismatch(record)