diff --git a/index.js b/index.js
index f11fb56..abb306a 100644
--- a/index.js
+++ b/index.js
@@ -105,6 +105,7 @@ function updateRecords(callStats, records) {
 
     // Update monthly totals
     if (!records.monthlyTotals) records.monthlyTotals = {};
+    if (!records.monthlyTotals[yesterday.getFullYear().toString()]) records.monthlyTotals[yesterday.getFullYear().toString()] = {};
     records.monthlyTotals[yesterday.getFullYear().toString()][yesterday.getMonth().toString()] = callStats.totalCallsThisMonth;
 
     if (isNewRecord) {