diff --git a/.github/workflows/release-build.yaml b/.github/workflows/release-build.yaml
index 013e9c2..7c978f9 100644
--- a/.github/workflows/release-build.yaml
+++ b/.github/workflows/release-build.yaml
@@ -1,7 +1,9 @@
 name: Release Build
 on: 
   release:
-    types: [created]
+    types: [published]
+  workflow_dispatch:
+
 jobs:
   releases-matrix:
     name: Release Go Binary
diff --git a/test/README.md b/test/README.md
index dc74b15..c0fc643 100644
--- a/test/README.md
+++ b/test/README.md
@@ -271,11 +271,11 @@ This implementation would be closer to the `Scalar consensus` as it does not alw
 |`$['a','a']`|`{"a":1}`|`[1 1]`|`[1 1]`|:white_check_mark:|
 |`$[?(@.key<3),?(@.key>6)]`|`[{"key": 1}, {"key": 8}, {"key": 3}, {"key": 10}, {"key": 7}, {"key": 2}, {"key": 6}, {"key": 4}]`|none|`[]`|:question:|
 |`$['key','another']`|`{ "key": "value", "another": "entry" }`|`[value entry]`|`[value entry]`|:white_check_mark:|
-|`$['missing','key']`|`{ "key": "value", "another": "entry" }`|`[value]`|`nil`|:no_entry:|
+|`$['missing','key']`|`{ "key": "value", "another": "entry" }`|`[value]`|`[value]`|:white_check_mark:|
 |`$[:]['c','d']`|`[{"c":"cc1","d":"dd1","e":"ee1"},{"c":"cc2","d":"dd2","e":"ee2"}]`|`[cc1 dd1 cc2 dd2]`|`[[cc1 dd1] [cc2 dd2]]`|:no_entry:|
 |`$[0]['c','d']`|`[{"c":"cc1","d":"dd1","e":"ee1"},{"c":"cc2","d":"dd2","e":"ee2"}]`|`[cc1 dd1]`|`[cc1 dd1]`|:white_check_mark:|
 |`$.*['c','d']`|`[{"c":"cc1","d":"dd1","e":"ee1"},{"c":"cc2","d":"dd2","e":"ee2"}]`|`[cc1 dd1 cc2 dd2]`|`[[cc1 dd1] [cc2 dd2]]`|:no_entry:|
-|`$..['c','d']`|`[{"c":"cc1","d":"dd1","e":"ee1"}, {"c": "cc2", "child": {"d": "dd2"}}, {"c": "cc3"}, {"d": "dd4"}, {"child": {"c": "cc5"}}]`|none|`[cc1 dd1]`|:question:|
+|`$..['c','d']`|`[{"c":"cc1","d":"dd1","e":"ee1"}, {"c": "cc2", "child": {"d": "dd2"}}, {"c": "cc3"}, {"d": "dd4"}, {"child": {"c": "cc5"}}]`|none|`[cc1 dd1 cc2 dd2 cc3 dd4 cc5]`|:question:|
 |`$[4,1]`|`[1,2,3,4,5]`|`[5 2]`|`[5 2]`|:white_check_mark:|
 |`$.*[0,:5]`|`{ "a": [ "string", null, true ], "b": [ false, "string", 5.4 ] }`|none|`nil`|:question:|
 |`$[1:3,4]`|`[1,2,3,4,5]`|none|`nil`|:question:|
diff --git a/test/union_test.go b/test/union_test.go
index ef52e17..e894540 100644
--- a/test/union_test.go
+++ b/test/union_test.go
@@ -41,11 +41,11 @@ func Test_Union(t *testing.T) {
 			expectedError: "",
 		},
 		{
-			query:         `$['missing','key']`, // TODO : should we error with invald keys?
+			query:         `$['missing','key']`,
 			data:          `{ "key": "value", "another": "entry" }`,
-			expected:      nil,
+			expected:      []interface{}{"value"},
 			consensus:     []interface{}{"value"},
-			expectedError: "union: invalid token key 'missing' not found",
+			expectedError: "",
 		},
 		{
 			query:         `$[:]['c','d']`,
@@ -71,7 +71,7 @@ func Test_Union(t *testing.T) {
 		{
 			query:         `$..['c','d']`,
 			data:          `[{"c":"cc1","d":"dd1","e":"ee1"}, {"c": "cc2", "child": {"d": "dd2"}}, {"c": "cc3"}, {"d": "dd4"}, {"child": {"c": "cc5"}}]`,
-			expected:      []interface{}{"cc1", "dd1"},
+			expected:      []interface{}{"cc1", "dd1", "cc2", "dd2", "cc3", "dd4", "cc5"},
 			consensus:     consensusNone,
 			expectedError: "",
 		},
@@ -113,5 +113,5 @@ func Test_Union(t *testing.T) {
 	}
 
 	batchTest(t, tests)
-	// printConsensusMatrix(tests)
+	//printConsensusMatrix(tests)
 }
diff --git a/token/options.go b/token/options.go
index 2cd9dfb..3fdae5e 100644
--- a/token/options.go
+++ b/token/options.go
@@ -23,4 +23,7 @@ type Options struct {
 	AllowMapReferenceByIndexInSubscript bool
 	// AllowStringReferenceByIndexInSubscript allow string characters to be referenced by index in subscript tokens.
 	AllowStringReferenceByIndexInSubscript bool
+
+	// FailUnionOnInvalidIdentifier force union tokens to fail on missing or invalid keys or invalid index.
+	FailUnionOnInvalidIdentifier bool
 }
diff --git a/token/union.go b/token/union.go
index 73389ea..e088d3d 100644
--- a/token/union.go
+++ b/token/union.go
@@ -10,23 +10,28 @@ import (
 func newUnionToken(arguments []interface{}, options *Options) *unionToken {
 	allowMap := false
 	allowString := false
+	failUnionOnInvalidIdentifier := false
 
 	if options != nil {
 		allowMap = options.AllowMapReferenceByIndex || options.AllowMapReferenceByIndexInUnion
 		allowString = options.AllowStringReferenceByIndex || options.AllowStringReferenceByIndexInUnion
+
+		failUnionOnInvalidIdentifier = options.FailUnionOnInvalidIdentifier
 	}
 
 	return &unionToken{
-		arguments:   arguments,
-		allowMap:    allowMap,
-		allowString: allowString,
+		arguments:                    arguments,
+		allowMap:                     allowMap,
+		allowString:                  allowString,
+		failUnionOnInvalidIdentifier: failUnionOnInvalidIdentifier,
 	}
 }
 
 type unionToken struct {
-	arguments   []interface{}
-	allowMap    bool
-	allowString bool
+	arguments                    []interface{}
+	allowMap                     bool
+	allowString                  bool
+	failUnionOnInvalidIdentifier bool
 }
 
 func (token *unionToken) String() string {
@@ -163,7 +168,7 @@ func (token *unionToken) getUnionByKey(obj interface{}, keys []string) ([]interf
 			}
 		}
 
-		if len(missingKeys) > 0 {
+		if token.failUnionOnInvalidIdentifier && len(missingKeys) > 0 {
 			sort.Strings(missingKeys)
 			return nil, getInvalidTokenKeyNotFoundError(token.Type(), strings.Join(missingKeys, ","))
 		}
@@ -183,7 +188,7 @@ func (token *unionToken) getUnionByKey(obj interface{}, keys []string) ([]interf
 			}
 		}
 
-		if len(missingKeys) > 0 {
+		if token.failUnionOnInvalidIdentifier && len(missingKeys) > 0 {
 			sort.Strings(missingKeys)
 			return nil, getInvalidTokenKeyNotFoundError(token.Type(), strings.Join(missingKeys, ","))
 		}
@@ -267,7 +272,10 @@ func (token *unionToken) getUnionByIndex(obj interface{}, indices []int64) (inte
 			idx = length + idx
 		}
 		if idx < 0 || idx >= length {
-			return nil, getInvalidTokenOutOfRangeError(token.Type())
+			if token.failUnionOnInvalidIdentifier {
+				return nil, getInvalidTokenOutOfRangeError(token.Type())
+			}
+			continue
 		}
 
 		if mapKeys != nil {
diff --git a/token/union_test.go b/token/union_test.go
index 6a300af..f461da5 100644
--- a/token/union_test.go
+++ b/token/union_test.go
@@ -42,6 +42,18 @@ func Test_newUnionToken(t *testing.T) {
 				allowString: false,
 			},
 		},
+		{
+			input: input{
+				options: &Options{
+					FailUnionOnInvalidIdentifier: true,
+				},
+			},
+			expected: &unionToken{
+				allowMap:                     false,
+				allowString:                  false,
+				failUnionOnInvalidIdentifier: true,
+			},
+		},
 		{
 			input: input{
 				options: &Options{
@@ -270,7 +282,7 @@ func Test_UnionToken_Apply(t *testing.T) {
 				},
 			},
 			expected: expected{
-				err: "union: invalid token out of range",
+				value: []interface{}{"one", "four"},
 			},
 		},
 		{
@@ -336,7 +348,7 @@ func Test_UnionToken_Apply(t *testing.T) {
 				},
 			},
 			expected: expected{
-				err: "union: invalid token key 'e' not found",
+				value: []interface{}{"one", "four"},
 			},
 		},
 		{
@@ -491,12 +503,36 @@ func Test_UnionToken_getUnionByIndex(t *testing.T) {
 				err: "union: invalid token target. expected [array slice] got [int]",
 			},
 		},
+		{
+			input: input{
+				token: &unionToken{
+					failUnionOnInvalidIdentifier: true,
+				},
+				obj:  []string{"one", "two", "three"},
+				keys: []int64{4},
+			},
+			expected: expected{
+				err: "union: invalid token out of range",
+			},
+		},
 		{
 			input: input{
 				token: &unionToken{},
 				obj:   []string{"one", "two", "three"},
 				keys:  []int64{4},
 			},
+			expected: expected{
+				obj: []interface{}{},
+			},
+		},
+		{
+			input: input{
+				token: &unionToken{
+					failUnionOnInvalidIdentifier: true,
+				},
+				obj:  []string{"one", "two", "three"},
+				keys: []int64{-10},
+			},
 			expected: expected{
 				err: "union: invalid token out of range",
 			},
@@ -508,7 +544,7 @@ func Test_UnionToken_getUnionByIndex(t *testing.T) {
 				keys:  []int64{-10},
 			},
 			expected: expected{
-				err: "union: invalid token out of range",
+				obj: []interface{}{},
 			},
 		},
 		{
@@ -703,7 +739,9 @@ func Test_UnionToken_getUnionByKey(t *testing.T) {
 		},
 		{
 			input: input{
-				token: &unionToken{},
+				token: &unionToken{
+					failUnionOnInvalidIdentifier: true,
+				},
 				obj: map[string]interface{}{
 					"a": "one",
 					"b": "two",
@@ -727,12 +765,46 @@ func Test_UnionToken_getUnionByKey(t *testing.T) {
 					"d": "four",
 					"e": "five",
 				},
+				keys: []string{"a", "b", "c", "f"},
+			},
+			expected: expected{
+				obj: []interface{}{"one", "two", "three"},
+			},
+		},
+		{
+			input: input{
+				token: &unionToken{
+					failUnionOnInvalidIdentifier: true,
+				},
+				obj: map[string]interface{}{
+					"a": "one",
+					"b": "two",
+					"c": "three",
+					"d": "four",
+					"e": "five",
+				},
 				keys: []string{"a", "b", "c", "f", "one", "blah"},
 			},
 			expected: expected{
 				err: "union: invalid token key 'blah,f,one' not found",
 			},
 		},
+		{
+			input: input{
+				token: &unionToken{},
+				obj: map[string]interface{}{
+					"a": "one",
+					"b": "two",
+					"c": "three",
+					"d": "four",
+					"e": "five",
+				},
+				keys: []string{"a", "b", "c", "f", "one", "blah"},
+			},
+			expected: expected{
+				obj: []interface{}{"one", "two", "three"},
+			},
+		},
 		{
 			input: input{
 				token: &unionToken{},
@@ -764,6 +836,18 @@ func Test_UnionToken_getUnionByKey(t *testing.T) {
 				},
 			},
 		},
+		{
+			input: input{
+				token: &unionToken{
+					failUnionOnInvalidIdentifier: true,
+				},
+				obj:  sampleStruct{},
+				keys: []string{"missing", "gone"},
+			},
+			expected: expected{
+				err: "union: invalid token key 'gone,missing' not found",
+			},
+		},
 		{
 			input: input{
 				token: &unionToken{},
@@ -771,7 +855,7 @@ func Test_UnionToken_getUnionByKey(t *testing.T) {
 				keys:  []string{"missing", "gone"},
 			},
 			expected: expected{
-				err: "union: invalid token key 'gone,missing' not found",
+				obj: []interface{}{},
 			},
 		},
 		{