Invalid time zone indicator ' '

This my Gson code:

protected Object fromJson(String json, Type t) {
try {
			Gson g = new Gson();
			Object o = g.fromJson(json, t);
			return o;
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
			return null;
  }
}

I have an object which have a 2 Timestamp fields and I want to consume a json response using Gson but I have got an Invalid time zone indicator ’ '.But this is not always happening. I don’t know why. So this is out put :

Caused by: java.text.ParseException: Failed to parse date ["2018-04-12 18:38:02']: Invalid time zone indicator ' '
	at com.google.gson.internal.bind.util.ISO8601Utils.parse(ISO8601Utils.java:274) ~[gson-2.8.2.jar!/:?]
	at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:72) ~[gson-2.8.2.jar!/:?]
	... 106 more
Caused by: java.lang.IndexOutOfBoundsException: Invalid time zone indicator ' '
	at com.google.gson.internal.bind.util.ISO8601Utils.parse(ISO8601Utils.java:245) ~[gson-2.8.2.jar!/:?]
	at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:72) ~[gson-2.8.2.jar!/:?]
	... 106 more

This my Gson data:

[
    {
        "id": 2267,
        "code": "2100130106335294543080001",
        "name": "ly123",
        "servicetype": "VOD",
        "showname": "ly123",
        "type1": 1,
        "pictureurl1": "",
        "pictureurl2": "",
        "status": 1,
        "isdelete": false,
        "checkstatus1": 10,
        "createtime": "2018-04-12 18:38:02",
        "updatetime": "2018-04-12 18:38:15",
        "description": "",
        "sgs": [],
        "sgCodes": [],
        "isPool": false
    }
]