The ubus object exists, but when called by invoke, it returns the status 4 about openwrt HOT 5 OPEN

Invalid Version reported. DISTRIB_REVISION='2.14.51'
Is this from a clean repository?

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Invalid Release reported. DISTRIB_RELEASE='22.03.3'
Is this from a clean repository?

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Invalid Target/Subtarget reported. DISTRIB_TARGET='rockchip/armv8'
Is this from a supported device?

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Can you repeat on mainstream stable OpenWRT and copy proper release tags?

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My problem has been resolved. My code has a mechanism that attempts to subscribe periodically after a subscription failure. The same struct ubus_subscriber has called API ubus_register_subscriber() multiple times, which can cause structural abnormalities in the avl tree

Just a suggestion, would it be better to do a check before insertion

diff --git a/libubus-obj.c b/libubus-obj.c
index 29cbb2b..aec0a4d 100644
--- a/libubus-obj.c
+++ b/libubus-obj.c
@@ -169,7 +169,9 @@ static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_a
 
        if (attrbuf[UBUS_ATTR_OBJTYPE])
                obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
-
+       /*
+        * Suggest: check if avl node exists in the AVL tree? and if it exists, would it be better to remove it first?
+        */
        obj->avl.key = &obj->id;
        avl_insert(&req->ctx->objects, &obj->avl);

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