diff --git a/src/util/bdthreads.cc b/src/util/bdthreads.cc
index b7990f1..6e79c67 100644
--- a/src/util/bdthreads.cc
+++ b/src/util/bdthreads.cc
@@ -75,7 +75,8 @@ bdThread::bdThread()
 
 void bdThread::join() /* waits for the the mTid thread to stop */
 {
-	pthread_join(mTid, NULL);
+	if(mTid > 0)
+		pthread_join(mTid, NULL);
 }
 
 void bdThread::stop()