diff --git a/module/rdd-tmr-dialog.js b/module/rdd-tmr-dialog.js
index 7ff6d0c3..d39e9bd6 100644
--- a/module/rdd-tmr-dialog.js
+++ b/module/rdd-tmr-dialog.js
@@ -250,6 +250,9 @@ export class RdDTMRDialog extends Dialog {
 
   /* -------------------------------------------- */
   async updateValuesDisplay() {
+    if (!this.rendered) {
+      return;
+    }
     const coord = this._getActorCoord();
 
     HtmlUtility._showControlWhen($(".lire-signe-draconique"), this.actor.isResonanceSigneDraconique(coord));