--- a/src/thread_base.cc	2010-01-26 09:40:34.000000000 +0300
+++ b/src/thread_base.cc	2010-01-31 18:38:25.000000000 +0300
@@ -191,5 +191,5 @@
 void
 ThreadBase::queue_item(thread_base_func newFunc) {
   m_threadQueue->push_back(newFunc);
-  pthread_kill(m_thread, SIGUSR1);
+  if(m_thread != NULL) pthread_kill(m_thread, SIGUSR1);
 }