1 files changed, 1 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index 7c8264598a..c17c91bfa2 100644
--- a/eval.c
+++ b/eval.c
@@ -5474,6 +5474,7 @@ gc_mark_threads()
 {
     thread_t th;
 
+    if (!curr_thread) return;
     FOREACH_THREAD(th) {
 	thread_mark(th);
     } END_FOREACH(th);