diff --git a/src/Processors/Sources/PythonSource.cpp b/src/Processors/Sources/PythonSource.cpp
index 6915cb710e8..e46c8e68bfc 100644
--- a/src/Processors/Sources/PythonSource.cpp
+++ b/src/Processors/Sources/PythonSource.cpp
@@ -1,3 +1,4 @@
+#include <exception>
 #include <Processors/Sources/PythonSource.h>
 #include "base/scope_guard.h"
 
@@ -106,7 +107,16 @@ void PythonSource::convert_string_array_to_block(
     offsets.reserve(row_count);
     for (size_t i = offset; i < offset + row_count; ++i)
     {
-        FillColumnString(buf[i], string_column);
+        auto * obj = buf[i];
+        if (!PyUnicode_Check(obj))
+        {
+            LOG_ERROR(
+                logger,
+                "Unsupported Python object type {}, Unicode string expected here. Try convert column type to str with `astype(str)`",
+                Py_TYPE(obj)->tp_name);
+            throw Exception(ErrorCodes::BAD_TYPE_OF_FIELD, "Unsupported Python object type {}", Py_TYPE(obj)->tp_name);
+        }
+        FillColumnString(obj, string_column);
         // Try to help reserve memory for the string column data every 100 rows to avoid frequent reallocations
         // Check the avg size of the string column data and reserve memory accordingly
         if ((i - offset) % 10 == 9)
@@ -278,11 +288,34 @@ Chunk PythonSource::genChunk(size_t & num_rows, PyObjectVecPtr data)
                     type->getName(),
                     description.sample_block.getByPosition(i).name);
         }
-        catch (const Exception & e)
+        catch (Exception & e)
+        {
+            destory(data);
+            LOG_ERROR(logger, "Error processing column \"{}\": {}", description.sample_block.getByPosition(i).name, e.what());
+            throw Exception(
+                ErrorCodes::PY_EXCEPTION_OCCURED,
+                "Error processing column \"{}\": {}",
+                description.sample_block.getByPosition(i).name,
+                e.what());
+        }
+        catch (std::exception & e)
+        {
+            destory(data);
+            LOG_ERROR(logger, "Error processing column \"{}\": {}", description.sample_block.getByPosition(i).name, e.what());
+            throw Exception(
+                ErrorCodes::PY_EXCEPTION_OCCURED,
+                "Error processing column \"{}\": {}",
+                description.sample_block.getByPosition(i).name,
+                e.what());
+        }
+        catch (...)
         {
             destory(data);
-            LOG_ERROR(logger, "Error processing column {}: {}", i, e.what());
-            throw;
+            LOG_ERROR(logger, "Error processing column \"{}\": unknown exception", description.sample_block.getByPosition(i).name);
+            throw Exception(
+                ErrorCodes::PY_EXCEPTION_OCCURED,
+                "Error processing column \"{}\": unknown exception",
+                description.sample_block.getByPosition(i).name);
         }
     }
 
@@ -415,10 +448,20 @@ Chunk PythonSource::scanDataToChunk()
                 // LOG_DEBUG(logger, "Column {} data: {}", col.name, ss.str());
             }
         }
-        catch (const Exception & e)
+        catch (Exception & e)
+        {
+            LOG_ERROR(logger, "Error processing column \"{}\": {}", col.name, e.what());
+            throw Exception(ErrorCodes::PY_EXCEPTION_OCCURED, "Error processing column \"{}\": {}", col.name, e.what());
+        }
+        catch (std::exception & e)
+        {
+            LOG_ERROR(logger, "Error processing column \"{}\": {}", col.name, e.what());
+            throw Exception(ErrorCodes::PY_EXCEPTION_OCCURED, "Error processing column \"{}\": {}", col.name, e.what());
+        }
+        catch (...)
         {
-            LOG_ERROR(logger, "Error processing column {}: {}", i, e.what());
-            throw;
+            LOG_ERROR(logger, "Error processing column \"{}\": unknown exception", col.name);
+            throw Exception(ErrorCodes::PY_EXCEPTION_OCCURED, "Error processing column \"{}\": unknown exception", col.name);
         }
     }
     cursor += count;
diff --git a/tests/test_issue251.py b/tests/test_issue251.py
new file mode 100644
index 00000000000..76b9a83d89f
--- /dev/null
+++ b/tests/test_issue251.py
@@ -0,0 +1,56 @@
+#!python3
+
+import os
+import unittest
+import zipfile
+import urllib.request
+
+import pandas as pd
+import chdb
+
+
+class TestIssue251(unittest.TestCase):
+    def setUp(self):
+        # if /tmp/issue251/artifacts/create_final_community_reports.parquet not exists,
+        # download https://github.com/user-attachments/files/16361689/parquet-test-data.zip
+        # and unzip it to /tmp/issue251/
+        if not os.path.exists(
+            "/tmp/issue251/artifacts/create_final_community_reports.parquet"
+        ):
+            print("Downloading parquet-test-data.zip")
+
+            url = "https://github.com/user-attachments/files/16361689/parquet-test-data.zip"
+            os.makedirs("/tmp/issue251/", exist_ok=True)
+            urllib.request.urlretrieve(url, "/tmp/issue251/parquet-test-data.zip")
+            with zipfile.ZipFile("/tmp/issue251/parquet-test-data.zip", "r") as zip_ref:
+                zip_ref.extractall("/tmp/issue251/")
+
+    def test_issue251(self):
+        df = pd.read_parquet(
+            "/tmp/issue251/artifacts/create_final_community_reports.parquet",
+            columns=[
+                "id",
+                "community",
+                "level",
+                "title",
+                "summary",
+                "findings",
+                "rank",
+                "rank_explanation",
+            ],
+        )
+
+        # make pandas show all columns
+        pd.set_option("display.max_columns", None)
+        print(df.head(2))
+        print(df.dtypes)
+        try:
+            chdb.query("FROM Python(df) SELECT * LIMIT 10")
+        except Exception as e:
+            self.assertTrue(
+                "Unsupported Python object type numpy.ndarray" in str(e)
+            )
+
+
+if __name__ == "__main__":
+    unittest.main()