|  | @@ -524,6 +524,9 @@ grpc_chttp2_stream *grpc_chttp2_parsing_lookup_stream(grpc_chttp2_transport *t,
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				|  |  |  grpc_chttp2_stream *grpc_chttp2_parsing_accept_stream(grpc_exec_ctx *exec_ctx,
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				|  |  |                                                        grpc_chttp2_transport *t,
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				|  |  |                                                        uint32_t id) {
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				|  |  | +  if (t->channel_callback.accept_stream == NULL) {
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				|  |  | +    return NULL;
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				|  |  | +  }
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				|  |  |    grpc_chttp2_stream *accepting;
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				|  |  |    GPR_ASSERT(t->accepting_stream == NULL);
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				|  |  |    t->accepting_stream = &accepting;
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