diff --git a/common/deliver/deliver.go b/common/deliver/deliver.go
index d42687edaaa..e87a85e2548 100644
--- a/common/deliver/deliver.go
+++ b/common/deliver/deliver.go
@@ -328,7 +328,7 @@ func (h *Handler) deliverBlocks(ctx context.Context, srv *Server, envelope *cb.E
 
 		logger.Debugf("[channel: %s] Delivering block [%d] for (%p) for %s", chdr.ChannelId, block.Header.Number, seekInfo, addr)
 
-		if seekInfo.ContentType == ab.SeekInfo_HEADER_WITH_SIG {
+		if seekInfo.ContentType == ab.SeekInfo_HEADER_WITH_SIG && !protoutil.IsConfigBlock(block) {
 			block.Data = nil
 		}
 
diff --git a/common/deliver/deliver_test.go b/common/deliver/deliver_test.go
index ed8aba91d86..f3c67d570ae 100644
--- a/common/deliver/deliver_test.go
+++ b/common/deliver/deliver_test.go
@@ -541,6 +541,73 @@ var _ = Describe("Deliver", func() {
 			})
 		})
 
+		Context("when seek info is configured to header with sig content type and block can be a config block", func() {
+			BeforeEach(func() {
+				seekInfo = &ab.SeekInfo{
+					Start:       &ab.SeekPosition{},
+					Stop:        seekNewest,
+					ContentType: ab.SeekInfo_HEADER_WITH_SIG,
+				}
+				fakeBlockReader.HeightReturns(4)
+				fakeBlockIterator.NextStub = func() (*cb.Block, cb.Status) {
+					nxtCallCount := fakeBlockIterator.NextCallCount()
+					block := &cb.Block{
+						Header:   &cb.BlockHeader{Number: uint64(nxtCallCount)},
+						Metadata: &cb.BlockMetadata{Metadata: [][]byte{{3}, {4}}},
+					}
+					if nxtCallCount == 1 || nxtCallCount == 3 {
+						block.Data = &cb.BlockData{Data: [][]byte{{1}, {2}}}
+					} else {
+						channelHeader = protoutil.MakeChannelHeader(cb.HeaderType_CONFIG, int32(1), "chain-1", 0)
+						payloadSignatureHeader := protoutil.MakeSignatureHeader(nil, make([]byte, 24))
+						protoutil.SetTxID(channelHeader, payloadSignatureHeader)
+						payloadHeader := protoutil.MakePayloadHeader(channelHeader, payloadSignatureHeader)
+						cg := protoutil.NewConfigGroup()
+						payload := &cb.Payload{Header: payloadHeader, Data: protoutil.MarshalOrPanic(&cb.ConfigEnvelope{Config: &cb.Config{ChannelGroup: cg}})}
+						envelope := &cb.Envelope{Payload: protoutil.MarshalOrPanic(payload), Signature: nil}
+
+						block.Data = &cb.BlockData{Data: [][]byte{protoutil.MarshalOrPanic(envelope)}}
+						block.Header.DataHash = nil
+					}
+					return block, cb.Status_SUCCESS
+				}
+			})
+
+			It("sends blocks with non nil Data", func() {
+				err := handler.Handle(context.Background(), server)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(fakeBlockReader.IteratorCallCount()).To(Equal(1))
+				start := fakeBlockReader.IteratorArgsForCall(0)
+				Expect(start).To(Equal(&ab.SeekPosition{}))
+				Expect(fakeBlockIterator.NextCallCount()).To(Equal(3))
+				Expect(fakeResponseSender.SendBlockResponseCallCount()).To(Equal(3))
+				for i := 0; i < fakeResponseSender.SendBlockResponseCallCount(); i++ {
+					b, _, _, _ := fakeResponseSender.SendBlockResponseArgsForCall(i)
+					if i+1 == 1 || i+1 == 3 {
+						Expect(b).To(Equal(&cb.Block{
+							Header:   &cb.BlockHeader{Number: uint64(i + 1)},
+							Data:     nil,
+							Metadata: &cb.BlockMetadata{Metadata: [][]byte{{3}, {4}}},
+						}))
+					} else {
+						payloadSignatureHeader := protoutil.MakeSignatureHeader(nil, make([]byte, 24))
+						protoutil.SetTxID(channelHeader, payloadSignatureHeader)
+						payloadHeader := protoutil.MakePayloadHeader(channelHeader, payloadSignatureHeader)
+						cg := protoutil.NewConfigGroup()
+						payload := &cb.Payload{Header: payloadHeader, Data: protoutil.MarshalOrPanic(&cb.ConfigEnvelope{Config: &cb.Config{ChannelGroup: cg}})}
+						envelope := &cb.Envelope{Payload: protoutil.MarshalOrPanic(payload), Signature: nil}
+						blk := &cb.Block{
+							Header:   &cb.BlockHeader{Number: uint64(i + 1)},
+							Data:     &cb.BlockData{Data: [][]byte{protoutil.MarshalOrPanic(envelope)}},
+							Metadata: &cb.BlockMetadata{Metadata: [][]byte{{3}, {4}}},
+						}
+						Expect(b).To(Equal(blk))
+						Expect(b.Data.Data).NotTo(BeNil())
+					}
+				}
+			})
+		})
+
 		Context("when filtered blocks are requested", func() {
 			var fakeResponseSender *mock.FilteredResponseSender
 
diff --git a/protoutil/commonutils.go b/protoutil/commonutils.go
index 9a9bc964ebf..bd948e07ed1 100644
--- a/protoutil/commonutils.go
+++ b/protoutil/commonutils.go
@@ -188,7 +188,16 @@ func SignOrPanic(signer identity.Signer, msg []byte) []byte {
 // IsConfigBlock validates whenever given block contains configuration
 // update transaction
 func IsConfigBlock(block *cb.Block) bool {
-	envelope, err := ExtractEnvelope(block, 0)
+	if block.Data == nil {
+		return false
+	}
+
+	if len(block.Data.Data) != 1 {
+		return false
+	}
+
+	marshaledEnvelope := block.Data.Data[0]
+	envelope, err := GetEnvelopeFromBlock(marshaledEnvelope)
 	if err != nil {
 		return false
 	}
diff --git a/protoutil/commonutils_test.go b/protoutil/commonutils_test.go
index 3abb286fa78..4c59e32daff 100644
--- a/protoutil/commonutils_test.go
+++ b/protoutil/commonutils_test.go
@@ -422,6 +422,22 @@ func TestIsConfigBlock(t *testing.T) {
 
 	result = IsConfigBlock(block)
 	require.False(t, result, "IsConfigBlock returns false for blocks with MESSAGE envelope")
+
+	// scenario 4: Data with more than one tx
+	result = IsConfigBlock(&cb.Block{
+		Header:   nil,
+		Data:     &cb.BlockData{Data: [][]byte{{1, 2, 3, 4}, {1, 2, 3, 4}}},
+		Metadata: nil,
+	})
+	require.False(t, result, "IsConfigBlock returns false for blocks with more than one transaction")
+
+	// scenario 5: nil data
+	result = IsConfigBlock(&cb.Block{
+		Header:   nil,
+		Data:     nil,
+		Metadata: nil,
+	})
+	require.False(t, result, "IsConfigBlock returns false for blocks with no data")
 }
 
 func TestEnvelopeToConfigUpdate(t *testing.T) {