crash trying to view fuel graphs

Hi,

here is a bug I reported several time on google play:

the apo crashes when I try to open the fuel graphs.

Here is the logcat.

Looks like an error while formatting a date. I tried to change the date format, but it's the same

01-12 22:02:50.522 27958 28003 E AndroidRuntime: Process: com.kajda.fuelio, PID: 27958

01-12 22:02:50.522 27958 28003 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.Date.getTime()' on a null object reference

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at java.util.Calendar.setTime(Calendar.java:1195)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at java.text.SimpleDateFormat.formatImpl(SimpleDateFormat.java:518)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at java.text.SimpleDateFormat.format(SimpleDateFormat.java:820)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at java.text.DateFormat.format(DateFormat.java:314)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at com.kajda.fuelio.Charts.ChartMonthlyCosts(SourceFile:741)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at com.kajda.fuelio.Charts$MyPagerAdapter$5.run(SourceFile:1808)

01-12 22:02:50.522 27958 28003 E AndroidRuntime: 	at java.lang.Thread.run(Thread.java:818)