diff -Naur a/boost/asio/detail/hash_map.hpp b/boost/asio/detail/hash_map.hpp
--- a/boost/asio/detail/hash_map.hpp	2012-01-15 19:16:25.000000000 +0530
+++ b/boost/asio/detail/hash_map.hpp	2012-11-26 18:12:21.000000000 +0530
@@ -181,6 +181,8 @@
   void erase(iterator it)
   {
     BOOST_ASSERT(it != values_.end());
+    if(0 == num_buckets_)
+      return;
 
     size_t bucket = calculate_hash_value(it->first) % num_buckets_;
     bool is_first = (it == buckets_[bucket].first);
@@ -244,6 +246,8 @@
     if (num_buckets == num_buckets_)
       return;
     num_buckets_ = num_buckets;
+    if(0 == num_buckets_)
+      return;
 
     iterator end_iter = values_.end();