diff -ur transcode-0.6.3/import/clone.c transcode-0.6.3-st/import/clone.c
--- transcode-0.6.3/import/clone.c	2002-05-03 12:30:11.000000000 +0100
+++ transcode-0.6.3-st/import/clone.c	2003-03-08 20:10:24.000000000 +0000
@@ -273,8 +273,10 @@
     void *status;
 
     // cancel the thread
-    pthread_cancel(thread);
-    pthread_join(thread, &status);
+    if(thread) {
+        pthread_cancel(thread);
+        pthread_join(thread, &status);
+    }
 
     //reentrance safe