diff --git a/utils/dataconverter.go b/utils/dataconverter.go
index b311b7fd5..8233b27b4 100644
--- a/utils/dataconverter.go
+++ b/utils/dataconverter.go
@@ -582,7 +582,7 @@ type JSONConverter struct{}
 func (jsnC JSONConverter) Convert(in interface{}) (interface{}, error) {
 	b, err := json.Marshal(in)
 	if err != nil {
-		return in, err
+		return EmptyString, err
 	}
 	return string(b), nil
 }
diff --git a/utils/dataconverter_test.go b/utils/dataconverter_test.go
index 5fe3d904d..413e61def 100644
--- a/utils/dataconverter_test.go
+++ b/utils/dataconverter_test.go
@@ -1243,8 +1243,10 @@ func TestDataConverterConvertJSONErrUnsupportedType(t *testing.T) {
 	}
 
 	experr := `json: unsupported type: func(int) bool`
-	if _, err := dc.Convert(obj); err == nil || err.Error() != experr {
+	if rcv, err := dc.Convert(obj); err == nil || err.Error() != experr {
 		t.Errorf("expected: <%+v>, \nreceived: <%+v>", experr, err)
+	} else if rcv != EmptyString {
+		t.Errorf("expected: <%+v>, \nreceived: <%+v>", EmptyString, rcv)
 	}
 }