diff --git a/lib/icinga/scheduleddowntime.cpp b/lib/icinga/scheduleddowntime.cpp
index c67bb10b3..4c03f45c9 100644
--- a/lib/icinga/scheduleddowntime.cpp
+++ b/lib/icinga/scheduleddowntime.cpp
@@ -131,6 +131,9 @@ std::pair<double, double> ScheduledDowntime::FindNextSegment(void)
 
 	Dictionary::Ptr ranges = GetRanges();
 
+	if (!ranges)
+		return std::make_pair(0, 0);
+
 	Array::Ptr segments = new Array();
 
 	Dictionary::Ptr bestSegment;