diff --git a/assets/js/vendor.js b/assets/js/vendor.js
index f5d56bf..354e303 100644
--- a/assets/js/vendor.js
+++ b/assets/js/vendor.js
@@ -15,15 +15,31 @@ import '../vendor/oms.min.js';
 // The UMD build automatically sets window.Chart
 import '../vendor/chart.umd.js';
 
-// 4. Load Chart.js date adapter AFTER Chart.js
+// 4. Create a fake CommonJS environment for the date adapter
+// The adapter expects to find Chart.js via require()
+if (typeof window !== 'undefined' && !window.require) {
+  window.require = function(module) {
+    if (module === 'chart.js') {
+      return window.Chart;
+    }
+    throw new Error('Module not found: ' + module);
+  };
+}
+
+// 5. Load Chart.js date adapter AFTER Chart.js and require shim
 // The adapter needs Chart to be available globally to register itself
 import '../vendor/chartjs-adapter-date-fns.bundle.min.js';
 
+// 6. Clean up the require shim
+if (typeof window !== 'undefined' && window.require) {
+  delete window.require;
+}
+
 // Verify libraries are loaded
 if (typeof window !== 'undefined') {
   console.log('Vendor libraries loaded:', {
     'Leaflet': !!window.L,
     'Chart.js': !!window.Chart,
-    'Chart.adapters': !!(window.Chart && window.Chart.adapters)
+    'Chart.adapters': !!(window.Chart && window.Chart._adapters)
   });
 }
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