So the google play developer console threw out this report on my game:
java.lang.NullPointerException
at Extensions.InAppControl.queryPurchases(InAppContro l.java:573)
at Extensions.InAppControl.queryInventory(InAppContro l.java:764)
at Extensions.InAppControl.queryInventory(InAppContro l.java:728)
at Extensions.InAppControl$3.run(InAppControl.java:82 4)
at java.lang.Thread.run(Thread.java:838)

It looks it has to do with the InApp purchases extension..
Does someone know what is it? and how can I fix it?