diff --git a/calendars.json b/calendars.json
index 8e50438..8d5d05e 100644
--- a/calendars.json
+++ b/calendars.json
@@ -1,34 +1,34 @@
 {
-    "linkGroups": [
-      {
-        "name": "Group 1",
-        "links": [
-          {
-            "url": "https://example.com/calendar1.ics",
-            "prefix": "Calendar 1",
-            "overrideSummary": false
-          },
-          {
-            "url": "https://example.com/calendar2.ics",
-            "prefix": "Calendar 2",
-            "overrideSummary": true
-          }
-        ]
-      },
-      {
-        "name": "Group 2",
-        "links": [
-          {
-            "url": "https://example.com/calendar3.ics",
-            "prefix": "Calendar 3",
-            "overrideSummary": false
-          },
-          {
-            "url": "https://example.com/calendar4.ics",
-            "prefix": "Calendar 4",
-            "overrideSummary": true
-          }
-        ]
-      }
-    ]
-  }
\ No newline at end of file
+  "linkGroups": [
+    {
+      "name": "Group 1",
+      "links": [
+        {
+          "url": "https://example.com/calendar1.ics",
+          "prefix": "Calendar 1",
+          "overrideSummary": false
+        },
+        {
+          "url": "https://example.com/calendar2.ics",
+          "prefix": "Calendar 2",
+          "overrideSummary": true
+        }
+      ]
+    },
+    {
+      "name": "Group 2",
+      "links": [
+        {
+          "url": "https://example.com/calendar3.ics",
+          "prefix": "Calendar 3",
+          "overrideSummary": false
+        },
+        {
+          "url": "https://example.com/calendar4.ics",
+          "prefix": "Calendar 4",
+          "overrideSummary": true
+        }
+      ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/server.js b/server.js
index a27917f..ba0a20d 100644
--- a/server.js
+++ b/server.js
@@ -132,9 +132,14 @@ async function updateMergedCalendar(){
         const calendarsFile = 'calendars.json';
         const calendarsData = JSON.parse(fs.readFileSync(calendarsFile, 'utf8'));
         
+        // Check if calendarsData is defined and has the expected structure
+    if (!calendarsData || !calendarsData.linkGroups) {
+        throw new Error('Invalid calendars data structure');
+      }
+      console.log(calendarsData);
         // Fetch calendar data for each link group
-        const promises = calendarsData.calendars.map((calendar) => {
-            return Promise.all(calendar.links.map((link) => {
+        const promises = calendarsData.linkGroups.map((linkGroup) => {
+            return Promise.all(linkGroup.links.map((link) => {
               return axios.get(link.url)
                 .then((response) => {
                   return {
@@ -210,7 +215,7 @@ END:VEVENT
 }
 
 // Schedule a cron job to update the merged calendar every hour
-cron.schedule('*/1 * * * *', () => {
+cron.schedule('*/3 * * * *', () => {
     console.log('Updating merged calendar...');
     updateMergedCalendar();
 });