diff --git a/deps/outliner/src/logseq/outliner/core.cljs b/deps/outliner/src/logseq/outliner/core.cljs
index 24e5bfb1d6..453c823bcf 100644
--- a/deps/outliner/src/logseq/outliner/core.cljs
+++ b/deps/outliner/src/logseq/outliner/core.cljs
@@ -11,6 +11,7 @@
             [logseq.db :as ldb]
             [logseq.db.common.order :as db-order]
             [logseq.db.frontend.class :as db-class]
+            [logseq.db.frontend.malli-schema :as db-malli-schema]
             [logseq.db.frontend.schema :as db-schema]
             [logseq.db.sqlite.create-graph :as sqlite-create-graph]
             [logseq.outliner.datascript :as ds]
@@ -836,15 +837,18 @@
   (let [top-level-blocks (filter-top-level-blocks db blocks)
         non-consecutive? (and (> (count top-level-blocks) 1) (seq (ldb/get-non-consecutive-blocks db top-level-blocks)))
         top-level-blocks* (get-top-level-blocks top-level-blocks non-consecutive?)
-        top-level-blocks (remove :logseq.property/built-in? top-level-blocks*)
+        undeletable? (fn [b] (or (:logseq.property/built-in? b)
+                                 (:file/path b)
+                                 (some-> (:db/ident b) db-malli-schema/internal-ident?)))
+        top-level-blocks (remove undeletable? top-level-blocks*)
         txs-state (ds/new-outliner-txs-state)
         block-ids (map (fn [b] [:block/uuid (:block/uuid b)]) top-level-blocks)
         start-block (first top-level-blocks)
         end-block (last top-level-blocks)
         delete-one-block? (or (= 1 (count top-level-blocks)) (= start-block end-block))]
 
-    ;; Validate before `when` since top-level-blocks will be empty when deleting one built-in block
-    (when (seq (filter :logseq.property/built-in? top-level-blocks*))
+    ;; Validate before `when` since top-level-blocks will be empty when deleting one built-in/internal block
+    (when (seq (filter undeletable? top-level-blocks*))
       (throw (ex-info "Built-in nodes can't be deleted"
                       {:type :notification
                        :payload {:message "Built-in nodes can't be deleted"
diff --git a/deps/outliner/test/logseq/outliner/core_test.cljs b/deps/outliner/test/logseq/outliner/core_test.cljs
index 276f144829..97f657db93 100644
--- a/deps/outliner/test/logseq/outliner/core_test.cljs
+++ b/deps/outliner/test/logseq/outliner/core_test.cljs
@@ -3,7 +3,8 @@
             [datascript.core :as d]
             [logseq.db :as ldb]
             [logseq.db.test.helper :as db-test]
-            [logseq.outliner.core :as outliner-core]))
+            [logseq.outliner.core :as outliner-core]
+            [logseq.common.config :as common-config]))
 
 (deftest test-delete-block-with-default-property
   (testing "Delete block with default property hard retracts the block subtree"
@@ -50,3 +51,32 @@
           child' (db-test/find-block-by-content @conn "child")]
       (is (nil? parent'))
       (is (nil? child')))))
+
+(deftest delete-blocks-rejects-built-in-entities
+  (let [conn (db-test/create-conn)]
+    (testing "built-in page is rejected"
+      (let [recycle-page (ldb/get-page @conn common-config/recycle-page-name)]
+        (is (true? (:logseq.property/built-in? recycle-page)))
+        (is (thrown-with-msg? js/Error #"Built-in nodes can't be deleted"
+                              (db-test/silence-stderr (outliner-core/delete-blocks! conn [recycle-page] {}))))))
+
+    (testing "built-in idents that are not a class or property like empty-placeholder are rejected"
+      (let [placeholder (d/entity @conn :logseq.property/empty-placeholder)]
+        (is (some? (:block/uuid placeholder)))
+        (is (thrown-with-msg? js/Error #"Built-in nodes can't be deleted"
+                              (db-test/silence-stderr (outliner-core/delete-blocks! conn [placeholder] {}))))))
+
+    (testing "file entity is rejected"
+      (let [file (->> (d/datoms @conn :avet :file/path)
+                      first
+                      :e
+                      (d/entity @conn))]
+        (is (some? (:file/path file)))
+        (is (thrown-with-msg? js/Error #"Built-in nodes can't be deleted"
+                              (db-test/silence-stderr (outliner-core/delete-blocks! conn [file] {}))))))
+
+    (testing "KV entity is rejected"
+      (let [kv (d/entity @conn :logseq.kv/db-type)]
+        (is (some? (:db/id kv)))
+        (is (thrown-with-msg? js/Error #"Built-in nodes can't be deleted"
+                              (db-test/silence-stderr (outliner-core/delete-blocks! conn [kv] {}))))))))