Fix use after free (#15825)

1 files changed, 3 insertions, 0 deletions

diff --git a/ml/ml.cc b/ml/ml.cc
index df131324af..212f437d22 100644
--- a/ml/ml.cc
+++ b/ml/ml.cc
@@ -1726,6 +1726,9 @@ void ml_stop_threads()
     Cfg.detection_stop = true;
     Cfg.training_stop = true;
 
+    if (!Cfg.detection_thread)
+        return;
+
     netdata_thread_cancel(Cfg.detection_thread);
     netdata_thread_join(Cfg.detection_thread, NULL);