diff --git a/collector/collector.go b/collector/collector.go
index 116309a..bb51209 100644
--- a/collector/collector.go
+++ b/collector/collector.go
@@ -397,7 +397,7 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 		)
 	} else {
 		for port, phoneNumberCallLog := range callLog.Lines {
-			if phoneNumberCallLog.Data == nil {
+			if phoneNumberCallLog.Data == nil || phoneNumberCallLog.Data.Entries == nil {
 				continue
 			}
 			for _, callLogEntry := range phoneNumberCallLog.Data.Entries { //port", "id", "external_number", "direction", "type