Don't segfault on header replay
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7663efc..3f3b288 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -389,6 +389,7 @@
 add_dependencies(buildtests_c public_headers_must_be_c89)
 add_dependencies(buildtests_c badreq_bad_client_test)
 add_dependencies(buildtests_c connection_prefix_bad_client_test)
+add_dependencies(buildtests_c duplicate_header_bad_client_test)
 add_dependencies(buildtests_c head_of_line_blocking_bad_client_test)
 add_dependencies(buildtests_c headers_bad_client_test)
 add_dependencies(buildtests_c initial_settings_frame_bad_client_test)
@@ -12312,6 +12313,35 @@
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 
+add_executable(duplicate_header_bad_client_test
+  test/core/bad_client/tests/duplicate_header.cc
+)
+
+
+target_include_directories(duplicate_header_bad_client_test
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+)
+
+target_link_libraries(duplicate_header_bad_client_test
+  ${_gRPC_SSL_LIBRARIES}
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  bad_client_test
+  grpc_test_util_unsecure
+  grpc_unsecure
+  gpr_test_util
+  gpr
+)
+
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
 add_executable(head_of_line_blocking_bad_client_test
   test/core/bad_client/tests/head_of_line_blocking.cc
 )