diff --git a/app/models/logic/empty_operator.rb b/app/models/logic/empty_operator.rb
index a70f4843b..0c9ab974d 100644
--- a/app/models/logic/empty_operator.rb
+++ b/app/models/logic/empty_operator.rb
@@ -4,4 +4,8 @@ class Logic::EmptyOperator < Logic::BinaryOperator
   def type = :empty
 
   def errors(_stable_ids = nil) = []
+
+  def compute(_champs = [])
+    true
+  end
 end
diff --git a/spec/models/logic/empty_operator_spec.rb b/spec/models/logic/empty_operator_spec.rb
new file mode 100644
index 000000000..16f4ba101
--- /dev/null
+++ b/spec/models/logic/empty_operator_spec.rb
@@ -0,0 +1,7 @@
+describe Logic::EmptyOperator do
+  include Logic
+
+  describe '#compute' do
+    it { expect(empty_operator(empty, empty).compute).to be true }
+  end
+end