diff --git a/src/connector/python/linux/python2/taos/cinterface.py b/src/connector/python/linux/python2/taos/cinterface.py
index 505619436cc1ad5d01a4134aede29477c6f6ae48..d9460efb213bfd3eb35d114676af49d611b8dd96 100644
--- a/src/connector/python/linux/python2/taos/cinterface.py
+++ b/src/connector/python/linux/python2/taos/cinterface.py
@@ -316,6 +316,9 @@ class CTaosInterface(object):
         blocks = [None] * len(fields)
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+            if data == None:
+                blocks[i] = [None] * num_of_rows
+                continue
 
             if fields[i]['type'] not in _CONVERT_FUNC:
                 raise DatabaseError("Invalid data type returned from database")
diff --git a/src/connector/python/linux/python3/taos/cinterface.py b/src/connector/python/linux/python3/taos/cinterface.py
index 7fcedc9fe9400cc8db007897906d4568c2eb234f..77001609b61d35c746ef2ef37702aa6fb1460106 100644
--- a/src/connector/python/linux/python3/taos/cinterface.py
+++ b/src/connector/python/linux/python3/taos/cinterface.py
@@ -316,6 +316,9 @@ class CTaosInterface(object):
         blocks = [None] * len(fields)
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+            if data == None:
+                blocks[i] = [None] * num_of_rows
+                continue
 
             if fields[i]['type'] not in _CONVERT_FUNC:
                 raise DatabaseError("Invalid data type returned from database")
diff --git a/src/connector/python/windows/python2/taos/cinterface.py b/src/connector/python/windows/python2/taos/cinterface.py
index f8cdfcc51ea1ea9ae5789c47f2b9e54879a53934..a18d372db2be482b289581f133c1c50e78f3adb0 100644
--- a/src/connector/python/windows/python2/taos/cinterface.py
+++ b/src/connector/python/windows/python2/taos/cinterface.py
@@ -316,6 +316,9 @@ class CTaosInterface(object):
         blocks = [None] * len(fields)
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+            if data == None:
+                blocks[i] = [None] * num_of_rows
+                continue
 
             if fields[i]['type'] not in _CONVERT_FUNC:
                 raise DatabaseError("Invalid data type returned from database")
diff --git a/src/connector/python/windows/python3/taos/cinterface.py b/src/connector/python/windows/python3/taos/cinterface.py
index b4b44e199c37cf90c9beddb16433591bc0713b23..cbcf2d884e37668c7100fefcea78e64d80f889b1 100644
--- a/src/connector/python/windows/python3/taos/cinterface.py
+++ b/src/connector/python/windows/python3/taos/cinterface.py
@@ -316,6 +316,9 @@ class CTaosInterface(object):
         blocks = [None] * len(fields)
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+            if data == None:
+                blocks[i] = [None] * num_of_rows
+                continue
 
             if fields[i]['type'] not in _CONVERT_FUNC:
                 raise DatabaseError("Invalid data type returned from database")