diff --git a/modules/rtp_rtcp/source/rtp_packet_history.cc b/modules/rtp_rtcp/source/rtp_packet_history.cc
index f7bb12e7e9..6a2253cd64 100644
--- a/modules/rtp_rtcp/source/rtp_packet_history.cc
+++ b/modules/rtp_rtcp/source/rtp_packet_history.cc
@@ -456,7 +456,8 @@ int RtpPacketHistory::GetPacketIndex(uint16_t sequence_number) const {
 RtpPacketHistory::StoredPacket* RtpPacketHistory::GetStoredPacket(
     uint16_t sequence_number) {
   int index = GetPacketIndex(sequence_number);
-  if (index < 0 || static_cast<size_t>(index) >= packet_history_.size()) {
+  if (index < 0 || static_cast<size_t>(index) >= packet_history_.size() ||
+      packet_history_[index].packet_ == nullptr) {
     return nullptr;
   }
   return &packet_history_[index];
diff --git a/modules/rtp_rtcp/source/rtp_packet_history_unittest.cc b/modules/rtp_rtcp/source/rtp_packet_history_unittest.cc
index 9e9d6213c9..fdf64d51bf 100644
--- a/modules/rtp_rtcp/source/rtp_packet_history_unittest.cc
+++ b/modules/rtp_rtcp/source/rtp_packet_history_unittest.cc
@@ -735,6 +735,20 @@ TEST_F(RtpPacketHistoryTest, PayloadPaddingWithEncapsulation) {
   EXPECT_EQ(padding_packet->SequenceNumber(), kStartSeqNum + 1);
 }
 
+TEST_F(RtpPacketHistoryTest, NackAfterAckIsNoop) {
+  hist_.SetStorePacketsStatus(StorageMode::kStoreAndCull, 2);
+  // Add two sent packets.
+  hist_.PutRtpPacket(CreateRtpPacket(kStartSeqNum),
+                     fake_clock_.TimeInMilliseconds());
+  hist_.PutRtpPacket(CreateRtpPacket(kStartSeqNum + 1),
+                     fake_clock_.TimeInMilliseconds());
+  // Remove newest one.
+  hist_.CullAcknowledgedPackets(std::vector<uint16_t>{kStartSeqNum + 1});
+  // Retransmission request for already acked packet, should be noop.
+  auto packet = hist_.GetPacketAndMarkAsPending(kStartSeqNum + 1);
+  EXPECT_EQ(packet.get(), nullptr);
+}
+
 TEST_F(RtpPacketHistoryTest, OutOfOrderInsertRemoval) {
   hist_.SetStorePacketsStatus(StorageMode::kStoreAndCull, 10);