fix: coredump when delta instance has metric unoperated

1 files changed, 1 insertions, 1 deletions

diff --git a/src/exporter/cjson_exporter.c b/src/exporter/cjson_exporter.c
index 608b393..e430f5a 100644
--- a/src/exporter/cjson_exporter.c
+++ b/src/exporter/cjson_exporter.c
@@ -958,7 +958,7 @@ char *fieldstat_json_exporter_export_with_delta(const struct fieldstat_json_expo
 
         struct json_writer *field_json_delta = json_writer_init();
         if (expair_delta_rearranged[i] != NULL) {
-            for (int j = 0; j < expair_acc[i].n_metric; j++) {
+            for (int j = 0; j < expair_delta_rearranged[i]->n_metric; j++) {
                 kv_pair_write_to_json(expair_delta_rearranged[i]->metric_pairs[j], field_json_delta);
             }
         }