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-rw-r--r--erts/emulator/sys/common/erl_check_io.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/erts/emulator/sys/common/erl_check_io.c b/erts/emulator/sys/common/erl_check_io.c
index a699ece23e..80e8030d74 100644
--- a/erts/emulator/sys/common/erl_check_io.c
+++ b/erts/emulator/sys/common/erl_check_io.c
@@ -1181,6 +1181,7 @@ enif_select_x(ErlNifEnv* env,
if (on) {
const Eterm recipient = pid ? pid->pid : env->proc->common.id;
+ ASSERT(is_internal_pid(recipient));
if (!state->driver.nif)
state->driver.nif = alloc_nif_select_data();
if (state->type == ERTS_EV_TYPE_NONE) {