diff --git a/ChangeLog b/ChangeLog
index c4b22eec..f9033d46 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,8 @@
 Changes in 2.0.2-alpha:
  o Add a new flag to bufferevents to make all callbacks automatically deferred.
  o Make evdns functionality locked, and automatically defer dns callbacks.
-        
+ o Fix a possible free(NULL) when freeing an event_base with no signals.
+
 Changes in 2.0.1-alpha:
  o free minheap on event_base_free(); from Christopher Layne
  o debug cleanups in signal.c; from Christopher Layne
diff --git a/signal.c b/signal.c
index 9313a8ae..15f0dd01 100644
--- a/signal.c
+++ b/signal.c
@@ -337,5 +337,6 @@ evsig_dealloc(struct event_base *base)
 	base->sig.sh_old_max = 0;
 
 	/* per index frees are handled in evsig_del() */
-	mm_free(base->sig.sh_old);
+	if (base->sig.sh_old)
+		mm_free(base->sig.sh_old);
 }