diff --git a/data_diff/diff_tables.py b/data_diff/diff_tables.py
index 74376f63..0086b878 100644
--- a/data_diff/diff_tables.py
+++ b/data_diff/diff_tables.py
@@ -213,6 +213,8 @@ def diff_tables(self, table1: TableSegment, table2: TableSegment, info_tree: Inf
     def _diff_tables_wrapper(self, table1: TableSegment, table2: TableSegment, info_tree: InfoTree) -> DiffResult:
         if is_tracking_enabled():
             options = attrs.asdict(self, recurse=False)
+            # not a useful event attribute
+            options.pop("_ignored_columns_lock")
             options["differ_name"] = type(self).__name__
             event_json = create_start_event_json(options)
             run_as_daemon(send_event_json, event_json)
diff --git a/data_diff/tracking.py b/data_diff/tracking.py
index 0fad464a..2f2a3370 100644
--- a/data_diff/tracking.py
+++ b/data_diff/tracking.py
@@ -201,10 +201,27 @@ def create_email_signup_event_json(email: str) -> Dict[str, Any]:
     }
 
 
+def convert_sets_to_lists(obj):
+    """
+    Recursively convert sets in the given object to lists.
+    """
+    if isinstance(obj, set):
+        return list(obj)
+    elif isinstance(obj, dict):
+        return {k: convert_sets_to_lists(v) for k, v in obj.items()}
+    elif isinstance(obj, list):
+        return [convert_sets_to_lists(elem) for elem in obj]
+    else:
+        return obj
+
+
 def send_event_json(event_json) -> None:
     if not g_tracking_enabled:
         raise RuntimeError("Won't send; tracking is disabled!")
 
+    # Convert sets to lists in event_json
+    event_json = convert_sets_to_lists(event_json)
+
     headers = {
         "Content-Type": "application/json",
         "Authorization": "Basic MkhndE00SGNxOUJtZWlDcU5ZaHo3Tzl0a2pNOg==",