1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 7fca3457c705..06e7b9f66de6 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1854,6 +1854,9 @@ static u64 hist_field_var_ref(struct hist_field *hist_field,
         struct hist_elt_data *elt_data;
         u64 var_val = 0;
 
+        if (WARN_ON_ONCE(!elt))
+                return var_val;
+
         elt_data = elt->private_data;
         var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];