diff --git a/quic/test_tools/fuzzing/quic_framer_process_data_packet_fuzzer.cc b/quic/test_tools/fuzzing/quic_framer_process_data_packet_fuzzer.cc
index db6f7a2..44dc275 100644
--- a/quic/test_tools/fuzzing/quic_framer_process_data_packet_fuzzer.cc
+++ b/quic/test_tools/fuzzing/quic_framer_process_data_packet_fuzzer.cc
@@ -150,6 +150,12 @@
           level, std::make_unique<NullDecrypter>(framer->perspective()));
     }
   }
+
+  if (!framer->version().KnowsWhichDecrypterToUse()) {
+    framer->SetDecrypter(
+        quic::ENCRYPTION_INITIAL,
+        std::make_unique<NullDecrypter>(framer->perspective()));
+  }
 }
 
 class FuzzingFramerVisitor : public NoOpFramerVisitor {