diff --git a/pymilvus/client/utils.py b/pymilvus/client/utils.py
index 9e51ad1c7..5b7dc4de2 100644
--- a/pymilvus/client/utils.py
+++ b/pymilvus/client/utils.py
@@ -159,15 +159,18 @@ def check_invalid_binary_vector(entities: List) -> bool:
             if not isinstance(entity["values"], list) or len(entity["values"]) == 0:
                 return False
 
+            if not isinstance(entity["values"][0], bytes):
+                return False
+
             dim = len(entity["values"][0]) * 8
             if dim == 0:
                 return False
 
             for values in entity["values"]:
-                if len(values) * 8 != dim:
-                    return False
                 if not isinstance(values, bytes):
                     return False
+                if len(values) * 8 != dim:
+                    return False
     return True
 
 
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index fc82fdaa0..f620df630 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -259,6 +259,18 @@ def test_empty_values(self):
         entities = [{"type": DataType.BINARY_VECTOR, "values": []}]
         assert utils.check_invalid_binary_vector(entities) is False
 
+    def test_non_sized_value(self):
+        entities = [{"type": DataType.BINARY_VECTOR, "values": [b"\x00\x01", None]}]
+        assert utils.check_invalid_binary_vector(entities) is False
+
+    def test_non_sized_first_value(self):
+        entities = [{"type": DataType.BINARY_VECTOR, "values": [None, b"\x00\x01"]}]
+        assert utils.check_invalid_binary_vector(entities) is False
+
+    def test_all_non_sized_values(self):
+        entities = [{"type": DataType.BINARY_VECTOR, "values": [1, 2]}]
+        assert utils.check_invalid_binary_vector(entities) is False
+
 
 class TestSparseParseSingleRow:
     def test_basic_parsing(self):