diff --git a/pkg/policy/bucket-policy_test.go b/pkg/policy/bucket-policy_test.go
index 94cfe9050..3d10fcee0 100644
--- a/pkg/policy/bucket-policy_test.go
+++ b/pkg/policy/bucket-policy_test.go
@@ -210,6 +210,51 @@ func TestUnmarshalBucketPolicy(t *testing.T) {
        }
     }
   ]
+}`, shouldSucceed: true},
+		// Test 10
+		{policyData: `{
+	"Version": "2012-10-17",
+	"Statement": [{
+		"Effect": "Deny",
+		"Principal": {
+			"AWS": [
+				"*"
+			]
+		},
+		"Action": [
+			"s3:PutObject"
+		],
+		"Resource": [
+			"arn:aws:s3:::mytest/*"
+		],
+		"Condition": {
+			"Null": {
+				"s3:x-amz-server-side-encryption": [
+					true
+				]
+			}
+		}
+	}]
+}`, shouldSucceed: true},
+		// Test 11
+		{policyData: `{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Deny",
+            "Principal": "*",
+            "Action": "s3:PutObject",
+            "Resource": [
+                "arn:aws:s3:::DOC-EXAMPLE-BUCKET1",
+                "arn:aws:s3:::DOC-EXAMPLE-BUCKET1/*"
+            ],
+            "Condition": {
+                "NumericLessThan": {
+                    "s3:TlsVersion": 1.2
+                }
+            }
+        }
+    ]
 }`, shouldSucceed: true},
 	}
 
diff --git a/pkg/set/stringset.go b/pkg/set/stringset.go
index c35e58e1a..2566a3df7 100644
--- a/pkg/set/stringset.go
+++ b/pkg/set/stringset.go
@@ -149,22 +149,19 @@ func (set StringSet) MarshalJSON() ([]byte, error) {
 }
 
 // UnmarshalJSON - parses JSON data and creates new set with it.
-// If 'data' contains JSON string array, the set contains each string.
-// If 'data' contains JSON string, the set contains the string as one element.
-// If 'data' contains Other JSON types, JSON parse error is returned.
 func (set *StringSet) UnmarshalJSON(data []byte) error {
-	sl := []string{}
+	sl := []interface{}{}
 	var err error
 	if err = json.Unmarshal(data, &sl); err == nil {
 		*set = make(StringSet)
 		for _, s := range sl {
-			set.Add(s)
+			set.Add(fmt.Sprintf("%v", s))
 		}
 	} else {
-		var s string
+		var s interface{}
 		if err = json.Unmarshal(data, &s); err == nil {
 			*set = make(StringSet)
-			set.Add(s)
+			set.Add(fmt.Sprintf("%v", s))
 		}
 	}
 
diff --git a/pkg/set/stringset_test.go b/pkg/set/stringset_test.go
index ec6dfbe63..278313135 100644
--- a/pkg/set/stringset_test.go
+++ b/pkg/set/stringset_test.go
@@ -19,6 +19,8 @@ package set
 
 import (
 	"fmt"
+	"reflect"
+	"sort"
 	"strings"
 	"testing"
 )
@@ -346,3 +348,106 @@ func TestStringSetToSlice(t *testing.T) {
 		}
 	}
 }
+
+func TestStringSet_UnmarshalJSON(t *testing.T) {
+	type args struct {
+		data         []byte
+		expectResult []string
+	}
+	tests := []struct {
+		name    string
+		set     StringSet
+		args    args
+		wantErr bool
+	}{
+		{
+			name: "test strings",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`["foo","bar"]`),
+				expectResult: []string{"foo", "bar"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test string",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`"foo"`),
+				expectResult: []string{"foo"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test bools",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`[false,true]`),
+				expectResult: []string{"false", "true"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test bool",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`false`),
+				expectResult: []string{"false"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test ints",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`[1,2]`),
+				expectResult: []string{"1", "2"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test int",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`1`),
+				expectResult: []string{"1"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test floats",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`[1.1,2.2]`),
+				expectResult: []string{"1.1", "2.2"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "test float",
+			set:  NewStringSet(),
+			args: args{
+				data:         []byte(`1.1`),
+				expectResult: []string{"1.1"},
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.set.UnmarshalJSON(tt.args.data); (err != nil) != tt.wantErr {
+				t.Errorf("UnmarshalJSON() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			slice := tt.set.ToSlice()
+			sort.Slice(slice, func(i, j int) bool {
+				return slice[i] < slice[j]
+			})
+			sort.Slice(tt.args.expectResult, func(i, j int) bool {
+				return tt.args.expectResult[i] < tt.args.expectResult[j]
+			})
+			if !reflect.DeepEqual(slice, tt.args.expectResult) {
+				t.Errorf("StringSet() get %v, want %v", tt.set.ToSlice(), tt.args.expectResult)
+			}
+		})
+	}
+}