diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7865430dd9..74a1951142 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ Please mark all change in change log and use the ticket from JIRA.
 # Milvus 0.5.1 (TODO)
 
 ## Bug
+- \#104 - test_scheduler core dump
+
 ## Improvement
 - \#64 - Improvement dump function in scheduler
 - \#80 - Print version information into log during server start
diff --git a/core/src/scheduler/resource/Resource.h b/core/src/scheduler/resource/Resource.h
index c797e13de8..2af44b3d90 100644
--- a/core/src/scheduler/resource/Resource.h
+++ b/core/src/scheduler/resource/Resource.h
@@ -119,6 +119,9 @@ class Resource : public Node, public std::enable_shared_from_this<Resource> {
     // TODO(wxyu): need double ?
     inline uint64_t
     TaskAvgCost() const {
+        if (total_task_ == 0) {
+            return 0;
+        }
         return total_cost_ / total_task_;
     }