1 files changed, 4 insertions, 2 deletions

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 7a32f447a8e7..b9c36ef42d2f 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -60,8 +60,10 @@ void thread__delete(struct thread *thread)
 {
         struct comm *comm, *tmp;
 
-        map_groups__put(thread->mg);
-        thread->mg = NULL;
+        if (thread->mg) {
+                map_groups__put(thread->mg);
+                thread->mg = NULL;
+        }
         list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
                 list_del(&comm->list);
                 comm__free(comm);