fix crash at application exit when encountering a blocked lane on which lane:cancel() has been called. (issue #28).

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lanes.c b/src/lanes.c
index b1c4018..eebe06a 100644
--- a/src/lanes.c
+++ b/src/lanes.c
@@ -1057,7 +1057,7 @@ static int selfdestruct_atexit( lua_State *L)
         while( s != SELFDESTRUCT_END )
         {
             // attempt a regular unforced cancel with a small timeout
-            bool_t cancelled = thread_cancel( s, 0.0001, FALSE);
+            bool_t cancelled = THREAD_ISNULL( s->thread) || thread_cancel( s, 0.0001, FALSE);
             // if we failed, and we know the thread is waiting on a linda
             if( cancelled == FALSE && s->status == WAITING && s->waiting_on != NULL)
             {