diff --git a/src/MathOptLazy.jl b/src/MathOptLazy.jl
index f9020af..4ad5156 100644
--- a/src/MathOptLazy.jl
+++ b/src/MathOptLazy.jl
@@ -440,7 +440,7 @@ function MOI.get(
     attr::MOI.ListOfConstraintIndices{F,S},
 ) where {F<:MOI.AbstractScalarFunction,S<:MOI.AbstractScalarSet}
     ret = MOI.get(model.inner, attr)
-    if (data = _data(model, F, S)) !== nothing
+    if (data = _maybe_data(model, F, S)) !== nothing
         in_model = Set(ci for (ci, z) in zip(data.index, data.active) if z)
         ret = filter!(ci -> !(ci in in_model), ret)
     end
diff --git a/test/runtests.jl b/test/runtests.jl
index 153592b..2afa1bd 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -101,6 +101,9 @@ function _basic_constraint_test_helper(
     F, S, IS = typeof(constraint_function), typeof(set), typeof(inner_set)
     @test MOI.supports_constraint(model, F, S)
     @test MOI.get(model, MOI.NumberOfConstraints{F,S}()) == 0
+    @test isempty(MOI.get(model, MOI.ListOfConstraintIndices{F,S}()))
+    @test MOI.get(model, MOI.NumberOfConstraints{F,IS}()) == 0
+    @test isempty(MOI.get(model, MOI.ListOfConstraintIndices{F,IS}()))
     c = MOI.add_constraint(model, constraint_function, set)
     if activate
         data = MathOptLazy._data(model, F, IS)