Delete ML-related data of a host in the proper order. (#12672)

Initialization of ML-related structures and threads should happen
when the underlying RRD objects have been fully initialized. Destruction
should happen in the opposite way, ie. before deleting an RRD host/dimension.

1 files changed, 4 insertions, 1 deletions

diff --git a/ml/ml.cc b/ml/ml.cc
index 44e200a236..b56401b07a 100644
--- a/ml/ml.cc
+++ b/ml/ml.cc
@@ -90,7 +90,10 @@ void ml_delete_dimension(RRDDIM *RD) {
         return;
 
     Host *H = static_cast<Host *>(RD->rrdset->rrdhost->ml_host);
-    H->removeDimension(D);
+    if (!H)
+        delete D;
+    else
+        H->removeDimension(D);
 
     RD->state->ml_dimension = nullptr;
 }