diff --git a/model/sync-interest-table.cc b/model/sync-interest-table.cc
index 767017c..5b1c3e0 100644
--- a/model/sync-interest-table.cc
+++ b/model/sync-interest-table.cc
@@ -45,7 +45,9 @@
 bool SyncInterestTable::insert(string interest)
 {
 	recursive_mutex::scoped_lock lock(m_mutex);
-	m_table.erase(m_table.find(interest));
+	unordered_map<string, time_t>::iterator it = m_table.find(interest);
+	if (it != m_table.end())
+		m_table.erase(it);
 	time_t currentTime = time(0);
 	m_table.insert(make_pair(interest, currentTime));
 }