diff --git a/assets/dashboard-charts.js b/assets/dashboard-charts.js
index ea5ab2a..3b9f26d 100644
--- a/assets/dashboard-charts.js
+++ b/assets/dashboard-charts.js
@@ -170,12 +170,15 @@ document.addEventListener('DOMContentLoaded', function() {
 
         // Initial draw
         console.log('[bubble chart] Initialisation avec taille proportionnelle ?', toggle.checked);
-        drawBubbleChart(toggle && toggle.checked);
-        // Listener
-        toggle.addEventListener('change', function() {
-            console.log('[bubble chart] Toggle changé, taille proportionnelle ?', toggle.checked);
-            drawBubbleChart(toggle.checked);
-        });
+        if(drawBubbleChart){
+
+            drawBubbleChart(toggle && toggle.checked);
+            // Listener
+            toggle.addEventListener('change', function() {
+                console.log('[bubble chart] Toggle changé, taille proportionnelle ?', toggle.checked);
+                drawBubbleChart(toggle.checked);
+            });
+        }
     }
     waitForChartAndDrawBubble();
 }); 
\ No newline at end of file