1 files changed, 3 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index bfa4a8c6d..29156c199 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1216,6 +1216,9 @@ popstackmark(struct stackmark *mark)
 {
         struct stack_block *sp;
 
+        if (!mark->stackp)
+                return;
+
         INT_OFF;
         markp = mark->marknext;
         while (stackp != mark->stackp) {