diff --git a/OsmAnd-telegram/src/net/osmand/telegram/TelegramSettings.kt b/OsmAnd-telegram/src/net/osmand/telegram/TelegramSettings.kt
index b35d004c43..227215c03c 100644
--- a/OsmAnd-telegram/src/net/osmand/telegram/TelegramSettings.kt
+++ b/OsmAnd-telegram/src/net/osmand/telegram/TelegramSettings.kt
@@ -998,12 +998,12 @@ class TelegramSettings(private val app: TelegramApplication) {
 	}
 
 	fun calcLivePeriod(periods: LinkedList<Long>): Long {
-		val copy = periods.toLongArray()
-		copy.sort()
-		return if (copy.size % 2 == 0) {
-			(copy[copy.size / 2] + copy[copy.size / 2 - 1]) / 2
+		val sortedPeriods = periods.toLongArray()
+		sortedPeriods.sort()
+		return if (sortedPeriods.size % 2 == 0) {
+			(sortedPeriods[sortedPeriods.size / 2] + sortedPeriods[sortedPeriods.size / 2 - 1]) / 2
 		} else {
-			copy[copy.size / 2]
+			sortedPeriods[sortedPeriods.size / 2]
 		}
 	}
 
diff --git a/OsmAnd-telegram/src/net/osmand/telegram/ui/MainActivity.kt b/OsmAnd-telegram/src/net/osmand/telegram/ui/MainActivity.kt
index 493f376c36..8f439b79d7 100644
--- a/OsmAnd-telegram/src/net/osmand/telegram/ui/MainActivity.kt
+++ b/OsmAnd-telegram/src/net/osmand/telegram/ui/MainActivity.kt
@@ -44,7 +44,7 @@ private const val MY_LOCATION_TAB_POS = 0
 private const val LIVE_NOW_TAB_POS = 1
 private const val TIMELINE_TAB_POS = 2
 
-class MainActivity : AppCompatActivity(), TelegramListener, ActionButtonsListener, TelegramIncomingMessagesListener, DataSetListener {
+class MainActivity : AppCompatActivity(), TelegramListener, ActionButtonsListener, TelegramIncomingMessagesListener {
 
 	private val log = PlatformUtil.getLog(MainActivity::class.java)
 
@@ -486,7 +486,7 @@ class MainActivity : AppCompatActivity(), TelegramListener, ActionButtonsListene
 		}
 	}
 
-	override fun onDataSetChanged() {
+	fun onDataSetChanged() {
 		viewPager.adapter?.notifyDataSetChanged()
 	}
 
@@ -522,7 +522,3 @@ class MainActivity : AppCompatActivity(), TelegramListener, ActionButtonsListene
 		}
 	}
 }
-
-interface DataSetListener {
-	fun onDataSetChanged()
-}
diff --git a/OsmAnd-telegram/src/net/osmand/telegram/ui/MyLocationTabFragment.kt b/OsmAnd-telegram/src/net/osmand/telegram/ui/MyLocationTabFragment.kt
index d3f07aea04..9596d6114a 100644
--- a/OsmAnd-telegram/src/net/osmand/telegram/ui/MyLocationTabFragment.kt
+++ b/OsmAnd-telegram/src/net/osmand/telegram/ui/MyLocationTabFragment.kt
@@ -856,7 +856,7 @@ class MyLocationTabFragment : Fragment(), TelegramListener {
 				} else {
 					settings.shareLocationToChat(lastChat.chat.id, true, lastChat.time)
 					app.shareLocationHelper.startSharingLocation()
-					(activity as DataSetListener).onDataSetChanged()
+					(activity as MainActivity).onDataSetChanged()
 				}
 			}