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-rw-r--r--activemodel/lib/active_model/mass_assignment_security/permission_set.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/mass_assignment_security/permission_set.rb b/activemodel/lib/active_model/mass_assignment_security/permission_set.rb
index 9661349503..415ab0ad17 100644
--- a/activemodel/lib/active_model/mass_assignment_security/permission_set.rb
+++ b/activemodel/lib/active_model/mass_assignment_security/permission_set.rb
@@ -5,7 +5,7 @@ module ActiveModel
class PermissionSet < Set
def +(values)
- super(values.map(&:to_s))
+ super(values.compact.map(&:to_s))
end
def include?(key)