No api key is required?

[pcg92]

Im using this library on an android app and it works 20% of times.
Sometimes Im having null response with this error:

 java.net.SocketTimeoutException: Read timed out
01-04 19:01:51.913 25734-25792/com.pumpunW/System.err:     at com.android.org.conscrypt.NativeCrypto.SSL_read(Native Method)

at com.pumpun.calixtina_weather.vendor.YahooWeather.getWeatherString(YahooWeather.java:295)

01-04 19:01:51.923 25734-25792/com.pumpunW/System.err: org.xml.sax.SAXParseException: Unexpected end of document
01-04 19:01:51.923 25734-25792/com.pumpunW/System.err:     at org.apache.harmony.xml.parsers.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:125)
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:107)
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at com.pumpun.calixtina_weather.vendor.YahooWeather.convertStringToDocument(YahooWeather.java:340)
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at com.pumpun.calixtina_weather.vendor.YahooWeather.access$400(YahooWeather.java:55)
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at com.pumpun.calixtina_weather.vendor.YahooWeather$WeatherQueryByLatLonTask.doInBackground(YahooWeather.java:503)
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at com.pumpun.calixtina_weather.vendor.YahooWeather$WeatherQueryByLatLonTask.doInBackground(YahooWeather.java:470)

01-04 19:01:51.933 25734-25792/com.pumpunW/System.err: java.lang.NullPointerException
01-04 19:01:51.933 25734-25792/com.pumpunW/System.err:     at com.pumpun.calixtina_weather.vendor.YahooWeather.parseWeatherInfo(YahooWeather.java:359)
01-04 19:01:51.933 25734-25792/com.pumpun.W/System.err:     at $500(YahooWeather.java:55)
01-04 19:01:51.943 25734-25792/com.pumpun.W/System.err:     at WeatherQueryByLatLonTask.doInBackground(YahooWeather.java:504)
W/System.err:     at $WeatherQueryByLatLonTask.doInBackground(YahooWeather.java:470)

I dont know why sometimes works and sometimes fail