diff --git a/docs/a8b7ef4627eb555f3abd.module.wasm b/docs/a8b7ef4627eb555f3abd.module.wasm
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diff --git a/docs/b9cbe12a5983b2270095.module.wasm b/docs/b9cbe12a5983b2270095.module.wasm
deleted file mode 100644
index 05dfdb9..0000000
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diff --git a/docs/bench/a8b7ef4627eb555f3abd.module.wasm b/docs/bench/a8b7ef4627eb555f3abd.module.wasm
new file mode 100644
index 0000000..4e496aa
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diff --git a/docs/bench/b9cbe12a5983b2270095.module.wasm b/docs/bench/b9cbe12a5983b2270095.module.wasm
deleted file mode 100644
index 05dfdb9..0000000
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diff --git a/docs/bench/bootstrap.js b/docs/bench/bootstrap.js
index 0f3c26d..7e46a7d 100644
--- a/docs/bench/bootstrap.js
+++ b/docs/bench/bootstrap.js
@@ -192,7 +192,7 @@
 /******/ 				promises.push(installedWasmModuleData);
 /******/ 			else {
 /******/ 				var importObject = wasmImportObjects[wasmModuleId]();
-/******/ 				var req = fetch(__webpack_require__.p + "" + {"../browser_pkg/jsonpath_wasm_bg.wasm":"b9cbe12a5983b2270095"}[wasmModuleId] + ".module.wasm");
+/******/ 				var req = fetch(__webpack_require__.p + "" + {"../browser_pkg/jsonpath_wasm_bg.wasm":"a8b7ef4627eb555f3abd"}[wasmModuleId] + ".module.wasm");
 /******/ 				var promise;
 /******/ 				if(importObject instanceof Promise && typeof WebAssembly.compileStreaming === 'function') {
 /******/ 					promise = Promise.all([WebAssembly.compileStreaming(req), importObject]).then(function(items) {
diff --git a/docs/bootstrap.js b/docs/bootstrap.js
index b5442a3..d102046 100644
--- a/docs/bootstrap.js
+++ b/docs/bootstrap.js
@@ -192,7 +192,7 @@
 /******/ 				promises.push(installedWasmModuleData);
 /******/ 			else {
 /******/ 				var importObject = wasmImportObjects[wasmModuleId]();
-/******/ 				var req = fetch(__webpack_require__.p + "" + {"../browser_pkg/jsonpath_wasm_bg.wasm":"b9cbe12a5983b2270095"}[wasmModuleId] + ".module.wasm");
+/******/ 				var req = fetch(__webpack_require__.p + "" + {"../browser_pkg/jsonpath_wasm_bg.wasm":"a8b7ef4627eb555f3abd"}[wasmModuleId] + ".module.wasm");
 /******/ 				var promise;
 /******/ 				if(importObject instanceof Promise && typeof WebAssembly.compileStreaming === 'function') {
 /******/ 					promise = Promise.all([WebAssembly.compileStreaming(req), importObject]).then(function(items) {
diff --git a/src/filter/value_wrapper.rs b/src/filter/value_wrapper.rs
index d654806..4b5922a 100644
--- a/src/filter/value_wrapper.rs
+++ b/src/filter/value_wrapper.rs
@@ -79,15 +79,15 @@ impl ValueWrapper {
 
         match self.val.deref() {
             RefValue::Array(vec) => {
-                let mut ret = Vec::new();
+                let mut set = IndexSet::new();
                 for v in vec {
                     if _filter_with_object(v, key, |vv| {
                         Self::cmp_with_term(vv, et, cmp, false, reverse)
                     }) {
-                        ret.push(v.clone());
+                        set.insert(v.clone());
                     }
                 }
-
+                let ret = set.into_iter().collect();
                 Some(ValueWrapper::new(RefValue::Array(ret).into(), false))
             }
             _ => None
@@ -109,12 +109,13 @@ impl ValueWrapper {
             _ => {
                 match &(*self.val) {
                     RefValue::Array(vec) => {
-                        let mut ret = Vec::new();
+                        let mut set = IndexSet::new();
                         for v in vec {
                             if Self::cmp_with_term(v, et, &cmp, false, reverse) {
-                                ret.push(v.clone());
+                                set.insert(v.clone());
                             }
                         }
+                        let ret = set.into_iter().collect();
                         ValueWrapper::new(RefValue::Array(ret).into(), false)
                     }
                     _ => {
diff --git a/tests/filter.rs b/tests/filter.rs
index 284303d..267b7a3 100644
--- a/tests/filter.rs
+++ b/tests/filter.rs
@@ -213,6 +213,24 @@ fn op_default() {
        { "name" : "이름2", "age" : 42, "phone" : "++44 12341234" }
     ]);
     assert_eq!(friends, jf.into_value());
+
+    let ref value = json!({
+        "school": {
+            "friends": [
+                {"name": "친구1", "age": 20},
+                {"name": "친구2", "age": 20}
+            ]
+        },
+        "friends": [
+            {"name": "친구3", "age": 30},
+            {"name": "친구4"}
+    ]});
+    let mut jf = JsonValueFilter::new_from_value(value.into());
+    let mut parser = Parser::new("$..[?(@.age >= 30)]");
+    parser.parse(&mut jf).unwrap();
+    let friends = json!([{ "name" : "친구3", "age" : 30 }]);
+    assert_eq!(friends, jf.into_value());
+
 }
 
 #[test]