diff --git a/crypto_stream_manager.go b/crypto_stream_manager.go
index 330b26da..64e78781 100644
--- a/crypto_stream_manager.go
+++ b/crypto_stream_manager.go
@@ -37,6 +37,9 @@ func (m *cryptoStreamManager) HandleCryptoFrame(frame *wire.CryptoFrame, encLeve
 		str = m.initialStream
 	case protocol.EncryptionHandshake:
 		str = m.handshakeStream
+	case protocol.Encryption1RTT:
+		// TODO(#981): process session tickets
+		return false, nil
 	default:
 		return false, fmt.Errorf("received CRYPTO frame with unexpected encryption level: %s", encLevel)
 	}
diff --git a/crypto_stream_manager_test.go b/crypto_stream_manager_test.go
index b57a0299..0c331cb4 100644
--- a/crypto_stream_manager_test.go
+++ b/crypto_stream_manager_test.go
@@ -98,8 +98,15 @@ var _ = Describe("Crypto Stream Manager", func() {
 		Expect(err).To(MatchError(err))
 	})
 
+	It("ignores post-handshake crypto data", func() {
+		changed, err := csm.HandleCryptoFrame(&wire.CryptoFrame{}, protocol.Encryption1RTT)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(changed).To(BeFalse())
+	})
+
 	It("errors for unknown encryption levels", func() {
-		_, err := csm.HandleCryptoFrame(&wire.CryptoFrame{}, protocol.Encryption1RTT)
-		Expect(err).To(MatchError("received CRYPTO frame with unexpected encryption level: 1-RTT"))
+		_, err := csm.HandleCryptoFrame(&wire.CryptoFrame{}, 42)
+		Expect(err).To(HaveOccurred())
+		Expect(err.Error()).To(ContainSubstring("received CRYPTO frame with unexpected encryption level"))
 	})
 })