diff --git a/src/nub.ts b/src/nub.ts
index b53b73f6a6cfdb1216435f883419d178ad1b279c..2cdd6c3e9cd4b2c9475d00bb6a95859530f0e579 100644
--- a/src/nub.ts
+++ b/src/nub.ts
@@ -841,7 +841,11 @@ export abstract class Nub extends ComputeNode implements IObservable {
                     // formulaire dont le Nub est la cible du lien
                     const destNub = Session.getInstance().findNubByUid(p.targetNub);
                     if (destNub) {
-                        param.defineReference(destNub, p.targetParam);
+                        try {
+                            param.defineReference(destNub, p.targetParam);
+                        } catch (err) {
+                            console.error("fixLinks: defineReference error");
+                        }
                     } else {
                         // quit
                         console.error("fixLinks : cannot find target Nub");
diff --git a/src/param/param-definition.ts b/src/param/param-definition.ts
index 0b9da88b47128a28b1fbb9d16af27189894b503d..be4a088010e87c9bbacbe18244cc7017c0318663 100644
--- a/src/param/param-definition.ts
+++ b/src/param/param-definition.ts
@@ -810,7 +810,11 @@ export class ParamDefinition implements INamedIterableValues, IObservable {
         // when loading parent Nub, setting mode to CALC would prevent ensuring
         // consistency when setting calculatedParam afterwards
         if (mode !== ParamValueMode.CALCUL || setCalcMode) {
-            this.valueMode = mode;
+            try {
+                this.valueMode = mode;
+            } catch (err) {
+                console.error("loadObjectRepresentation: set valueMode error");
+            }
         }
 
         // detect if this is the calculated param - used by Nub.loadObjectRepresentation()
@@ -842,7 +846,11 @@ export class ParamDefinition implements INamedIterableValues, IObservable {
                 // formulaire dont le Nub est la cible du lien
                 const destNub = Session.getInstance().findNubByUid(obj.targetNub);
                 if (destNub) {
-                    this.defineReference(destNub, obj.targetParam);
+                    try {
+                        this.defineReference(destNub, obj.targetParam);
+                    } catch (err) {
+                        console.error("loadObjectRepresentation: defineReference error");
+                    }
                 } // si la cible du lien n'existe pas, Session.fixLinks() est censé s'en occuper
                 break;