diff --git a/src/ydata_profiling/profile_report.py b/src/ydata_profiling/profile_report.py
index 79b94aa00..4825a4567 100644
--- a/src/ydata_profiling/profile_report.py
+++ b/src/ydata_profiling/profile_report.py
@@ -450,7 +450,9 @@ def encode_it(o: Any) -> Any:
                     return [encode_it(v) for v in o]
                 elif isinstance(o, set):
                     return {encode_it(v) for v in o}
-                elif isinstance(o, (pd.DataFrame, pd.Series)):
+                elif isinstance(o, pd.Series):
+                    return encode_it(o.to_list())
+                elif isinstance(o, pd.DataFrame):
                     return encode_it(o.to_dict(orient="records"))
                 elif isinstance(o, np.ndarray):
                     return encode_it(o.tolist())
diff --git a/tests/issues/test_issue1529.py b/tests/issues/test_issue1529.py
new file mode 100644
index 000000000..e43199430
--- /dev/null
+++ b/tests/issues/test_issue1529.py
@@ -0,0 +1,34 @@
+"""
+Test for issue 1529:
+https://github.com/ydataai/ydata-profiling/issues/1529
+"""
+import json
+
+import pandas as pd
+
+from ydata_profiling import ProfileReport
+
+
+def test_issue1529():
+    previous_dataset = pd.DataFrame(
+        data=[(1000, 42), (900, 30), (1500, 40), (1800, 38)],
+        columns=["rent_per_month", "total_area"],
+    )
+    current_dataset = pd.DataFrame(
+        data=[(5000, 350), (9000, 600), (5000, 400), (3500, 500), (6000, 600)],
+        columns=["rent_per_month", "total_area"],
+    )
+    previous_dataset_report = ProfileReport(
+        previous_dataset, title="Previous dataset report"
+    )
+    current_dataset_report = ProfileReport(
+        current_dataset, title="Current dataset report"
+    )
+    comparison_report = previous_dataset_report.compare(current_dataset_report)
+    json_str = comparison_report.to_json()
+    compare_dict = json.loads(json_str)
+    assert compare_dict is not None and len(compare_dict) > 0
+    assert (
+        compare_dict["analysis"]["title"]
+        == "<em>Comparing</em> Previous dataset report <em>and</em> Current dataset report"
+    )