Fixes issues with Year criteria

app/src/main/java/net/pokeranalytics/android/model/Criteria.kt

@@ -223,10 +223,10 @@ sealed class Criteria(override var uniqueIdentifier: Int) : IntIdentifiable, Row
 				is Years -> {
 					val years = arrayListOf<Query>()
 					val realm = Realm.getDefaultInstance()
-					val lastSession = realm.where<Session>().sort("startDate", Sort.DESCENDING).findFirst()
+					val lastSession = realm.where<Session>().isNotNull("startDate").sort("startDate", Sort.DESCENDING).findFirst()
 					val yearNow = lastSession?.year ?: return years
 
-					realm.where<Session>().sort("year", Sort.ASCENDING).findFirst()?.year?.let {
+					realm.where<Session>().isNotNull("startDate").sort("year", Sort.ASCENDING).findFirst()?.year?.let {
 						for (index in 0..(yearNow - it)) {
 							val yearCondition = QueryCondition.AnyYear().apply {
 								listOfValues = arrayListOf(it + index)