diff --git a/legend-engine-core/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/planHelper/PrimitiveValueSpecificationToObjectVisitor.java b/legend-engine-core/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/planHelper/PrimitiveValueSpecificationToObjectVisitor.java
index e46e38e193b..f9696e0815d 100644
--- a/legend-engine-core/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/planHelper/PrimitiveValueSpecificationToObjectVisitor.java
+++ b/legend-engine-core/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/planHelper/PrimitiveValueSpecificationToObjectVisitor.java
@@ -46,6 +46,7 @@
 import org.finos.legend.engine.protocol.pure.v1.model.valueSpecification.raw.UnitInstance;
 import org.finos.legend.engine.protocol.pure.v1.model.valueSpecification.raw.UnitType;
 import org.finos.legend.engine.protocol.pure.v1.model.valueSpecification.raw.Whatever;
+import org.finos.legend.engine.protocol.pure.v1.model.valueSpecification.raw.classInstance.PureList;
 
 import java.io.ByteArrayInputStream;
 
@@ -132,7 +133,15 @@ public Object visit(EnumValue enumValue)
     @Override
     public Object visit(ClassInstance iv)
     {
-        return iv.value;
+        switch (iv.type)
+        {
+            case "listInstance":
+                return ListIterate.collect(((PureList) iv.value).values, x -> x.accept(this));
+            case "path":
+                return iv.value;                
+            default:
+                throw new UnsupportedOperationException("Unsupported ClassInstance type: " + iv.type);
+        }
     }
 
     @Override