KM-15232: replace removeFirst with removeAt(0)

Author: kp-raafat-alhmidi

kpi/src/commonMain/kotlin/com/privateinternetaccess/kpi/internals/KPI.kt

@@ -372,8 +372,8 @@ internal class KPI(
 
         // Update sample events. If we have more than the max of sample events supported.
         // Clear the oldest one before adding the new one.
-        if (sampleEvents.size >= eventsHistorySize) {
-            sampleEvents.removeFirst()
+        if (sampleEvents.size >= eventsHistorySize && sampleEvents.isNotEmpty()) {
+            sampleEvents.removeAt(0)
         }
         sampleEvents.add(event)
     }

kpi/src/commonMain/kotlin/com/privateinternetaccess/kpi/internals/KPIPersistencyImpl.kt

@@ -91,8 +91,8 @@ internal class KPIPersistencyImpl internal constructor(
 
         // Update sample events.
         val recentEvents = sampleEvents().toMutableList()
-        if (recentEvents.size > eventHistorySize) {
-            recentEvents.removeFirst()
+        if (recentEvents.size > eventHistorySize && recentEvents.isNotEmpty()) {
+            recentEvents.removeAt(0)
         }
         recentEvents.add(event)
         val jsonString = json.encodeToString(