diff --git a/internal/json/types.go b/internal/json/types.go
index f343c86..bc8bc09 100644
--- a/internal/json/types.go
+++ b/internal/json/types.go
@@ -373,12 +373,17 @@ func (e Encoder) AppendInterface(dst []byte, i interface{}) []byte {
 // AppendObjectData takes in an object that is already in a byte array
 // and adds it to the dst.
 func (Encoder) AppendObjectData(dst []byte, o []byte) []byte {
-	// Two conditions we want to put a ',' between existing content and
-	// new content:
-	// 1. new content starts with '{' - which shd be dropped   OR
-	// 2. existing content has already other fields
+	// Three conditions apply here:
+	// 1. new content starts with '{' - which should be dropped   OR
+	// 2. new content starts with '{' - which should be replaced with ','
+	//    to separate with existing content OR
+	// 3. existing content has already other fields
 	if o[0] == '{' {
-		o[0] = ','
+		if len(dst) == 0 {
+			o = o[1:]
+		} else {
+			o[0] = ','
+		}
 	} else if len(dst) > 1 {
 		dst = append(dst, ',')
 	}
diff --git a/internal/json/types_test.go b/internal/json/types_test.go
index f396299..9a9d668 100644
--- a/internal/json/types_test.go
+++ b/internal/json/types_test.go
@@ -165,3 +165,23 @@ func Test_appendMac(t *testing.T) {
 		})
 	}
 }
+
+func Test_appendObjectData(t *testing.T) {
+	tests := []struct {
+		dst  []byte
+		obj  []byte
+		want []byte
+	}{
+		{[]byte{}, []byte(`{"foo":"bar"}`), []byte(`"foo":"bar"}`)},
+		{[]byte(`{"qux":"quz"`), []byte(`{"foo":"bar"}`), []byte(`{"qux":"quz","foo":"bar"}`)},
+		{[]byte{}, []byte(`"foo":"bar"`), []byte(`"foo":"bar"`)},
+		{[]byte(`{"qux":"quz"`), []byte(`"foo":"bar"`), []byte(`{"qux":"quz","foo":"bar"`)},
+	}
+	for _, tt := range tests {
+		t.Run("ObjectData", func(t *testing.T) {
+			if got := enc.AppendObjectData(tt.dst, tt.obj); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("appendObjectData() = %s, want %s", got, tt.want)
+			}
+		})
+	}
+}