diff --git a/app/static/js/fuenf_minuten.js b/app/static/js/fuenf_minuten.js
index e93b3dc..f419082 100644
--- a/app/static/js/fuenf_minuten.js
+++ b/app/static/js/fuenf_minuten.js
@@ -4,6 +4,9 @@ document.addEventListener('DOMContentLoaded', function() {
     const startTimeInput = document.getElementById('startTime');
     const endTimeInput = document.getElementById('endTime');
 
+    // Initialisiere die globale Variable für den Chart
+    window.fuenfMinutenChart = null;
+
     function fetchAndUpdateChart() {
         const startDate = startDateInput.value;
         const endDate = endDateInput.value;
@@ -32,10 +35,12 @@ document.addEventListener('DOMContentLoaded', function() {
 
                 const ctx = document.getElementById('fuenfMinutenChart').getContext('2d');
 
+                // Zerstöre den vorhandenen Chart, falls er existiert
                 if (window.fuenfMinutenChart) {
                     window.fuenfMinutenChart.destroy();
                 }
 
+                // Erstelle einen neuen Chart
                 window.fuenfMinutenChart = new Chart(ctx, {
                     type: 'bar',
                     data: {