diff --git a/src/blp/blp.py b/src/blp/blp.py
index 7ace55a..0ac26f9 100644
--- a/src/blp/blp.py
+++ b/src/blp/blp.py
@@ -886,9 +886,10 @@ def collect_many_to_bds(self, responses) -> Dict:
             sec_dict = res.get(security, {})
             for field in response["data"]:
                 data = response["data"][field]
-                rows = sec_dict.get(field, [])
-                rows.extend(data)
-                sec_dict[field] = rows
+                if data:
+                    rows = sec_dict.get(field, [])
+                    rows.extend(data)
+                    sec_dict[field] = rows
             res[security] = sec_dict
         for s in res:
             for f in res[s]:
diff --git a/src/blp/test/test_blp.py b/src/blp/test/test_blp.py
index d6b31e6..acf1ca6 100644
--- a/src/blp/test/test_blp.py
+++ b/src/blp/test/test_blp.py
@@ -2448,19 +2448,22 @@ def collector_params():
             "INDX_MWEIGHT_HIST": pandas.DataFrame({"Index Member": ["BON9", "C N9"], "Percent Weight": [2.89, 5.32]})
         }
     }
+    # test for https://github.com/matthewgilbert/blp/pull/8
+    bulk_reference_parsed_data_empty = [
+        {"security": "TRAD3 BZ Equity", "fields": ["DVD_HIST_ALL"], "data": {"DVD_HIST_ALL": None}}
+    ]
+    bulk_reference_empty_collected_exp = {"TRAD3 BZ Equity": {}}
+
     return {
-        "ids": ["collect_many_to_bds_single_bulk", "collect_many_to_bds_with_multi_bulk"],
+        "ids": [
+            "collect_many_to_bds_single_bulk",
+            "collect_many_to_bds_with_multi_bulk",
+            "collect_many_empty_to_bds_single_bulk",
+        ],
         "argvalues": [
-            (
-                bulk_reference_parsed_data,
-                blp.BlpQuery().collect_many_to_bds,
-                bulk_reference_collected_exp,
-            ),
-            (
-                bulk_reference_parsed_data_multi,
-                blp.BlpQuery().collect_many_to_bds,
-                bulk_reference_collected_multi_exp,
-            ),
+            (bulk_reference_parsed_data, blp.BlpQuery().collect_many_to_bds, bulk_reference_collected_exp),
+            (bulk_reference_parsed_data_multi, blp.BlpQuery().collect_many_to_bds, bulk_reference_collected_multi_exp),
+            (bulk_reference_parsed_data_empty, blp.BlpQuery().collect_many_to_bds, bulk_reference_empty_collected_exp),
         ],
     }