diff --git a/src/param/param-values.ts b/src/param/param-values.ts
index cd30b2945f7588c055b6efdd93416a0725fc3b1c..9f72b116427282de8484e0d4252d679345a3a473 100644
--- a/src/param/param-values.ts
+++ b/src/param/param-values.ts
@@ -157,7 +157,7 @@ export class ParamValues implements IObjectReference {
     }
 
     public get uncheckedValue() {
-        return this._singleValue.uncheckedValue;
+        return this._currentValue.uncheckedValue;
     }
 
     public setSingleValue(v: number) {
@@ -167,7 +167,7 @@ export class ParamValues implements IObjectReference {
     }
 
     public get isDefined() {
-        return this._singleValue.isDefined;
+        return this._currentValue.isDefined;
     }
 
     public get min() {