diff --git a/src/policy_eppfrd.cpp b/src/policy_eppfrd.cpp
index d2ba449c..9c56fa68 100644
--- a/src/policy_eppfrd.cpp
+++ b/src/policy_eppfrd.cpp
@@ -155,6 +155,9 @@ namespace eppfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)
diff --git a/src/policy_msppfrd.cpp b/src/policy_msppfrd.cpp
index baa1bd95..ea6d770f 100644
--- a/src/policy_msppfrd.cpp
+++ b/src/policy_msppfrd.cpp
@@ -114,6 +114,9 @@ namespace msppfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)
diff --git a/src/policy_pfrd.cpp b/src/policy_pfrd.cpp
index 2862d3ca..45d03051 100644
--- a/src/policy_pfrd.cpp
+++ b/src/policy_pfrd.cpp
@@ -84,6 +84,9 @@ namespace pfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)