diff --git a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
index 413a307bc..bb7a46ba2 100644
--- a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
+++ b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
@@ -111,7 +111,8 @@ export class AssignReviewerApproverDialogComponent extends IqserDialogComponent<
 
         const assignee = files[0].assignee;
         if (hasOnlyOneFile && this.permissionsService.isApprover(this.#dossier, assignee)) {
-            return assignee;
+            const foundAssignee = this.userOptions.find(userOption => userOption === assignee);
+            return foundAssignee ?? this.#userOptions[0];
         }
 
         return this.#isApprover ? this.currentUser.id : this.userOptions.at(0);