Do not start timer if transport is closed.
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
index 0d6b72c..bc6fa0d 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
@@ -2663,6 +2663,9 @@
static void start_keepalive_ping_locked(void* arg, grpc_error* error) {
grpc_chttp2_transport* t = static_cast<grpc_chttp2_transport*>(arg);
+ if (error != GRPC_ERROR_NONE) {
+ return;
+ }
GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive watchdog");
grpc_timer_init(&t->keepalive_watchdog_timer,
grpc_core::ExecCtx::Get()->Now() + t->keepalive_timeout,