diff --git a/src/app/components/generic-calculator/calculator.component.ts b/src/app/components/generic-calculator/calculator.component.ts
index 806b377770fc6db58d5a79634ab78d4290607505..e8c97032324028131f9dda6cb21bf7938681d244 100644
--- a/src/app/components/generic-calculator/calculator.component.ts
+++ b/src/app/components/generic-calculator/calculator.component.ts
@@ -88,7 +88,11 @@ export class GenericCalculatorComponent extends BaseComponent implements OnInit,
     private formulaireService: FormulaireService;
 
     public get ID() {
-        return this._formulaire.uid;
+        if (this._formulaire) {
+            return this._formulaire.uid;
+        } else {
+            return "calculator_1";
+        }
     }
 
     constructor(