diff --git a/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotuneIob.kt b/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotuneIob.kt
index bac89d9f9e..925d290ee4 100644
--- a/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotuneIob.kt
+++ b/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotuneIob.kt
@@ -39,7 +39,7 @@ open class AutotuneIob @Inject constructor(
     private val autotuneFS: AutotuneFS
 ) {
 
-    private val nsTreatments = ArrayList<NsTreatment>()
+    private var nsTreatments = ArrayList<NsTreatment>()
     private var dia: Double = Constants.defaultDIA
     var boluses: ArrayList<Bolus> = ArrayList()
     var meals = ArrayList<Carbs>()
@@ -59,11 +59,11 @@ open class AutotuneIob @Inject constructor(
         initializeTreatmentData(from - range(), to)
         initializeTempBasalData(from - range(), to, tunedProfile)
         initializeExtendedBolusData(from - range(), to, tunedProfile)
-        tempBasals.sortWith { o1: TemporaryBasal, o2: TemporaryBasal -> (o2.timestamp - o1.timestamp).toInt() }
+        tempBasals = ArrayList(tempBasals.toList().sortedWith { o1: TemporaryBasal, o2: TemporaryBasal -> (o2.timestamp - o1.timestamp).toInt() })
         // Without Neutral TBR, Autotune Web will ignore iob for periods without TBR running
         addNeutralTempBasal(from - range(), to, tunedProfile)
-        nsTreatments.sortWith { o1: NsTreatment, o2: NsTreatment -> (o2.date - o1.date).toInt() }
-        this.boluses.sortWith { o1: Bolus, o2: Bolus -> (o2.timestamp - o1.timestamp).toInt() }
+        nsTreatments = ArrayList(nsTreatments.toList().sortedWith { o1: NsTreatment, o2: NsTreatment -> (o2.date - o1.date).toInt() })
+        boluses = ArrayList(boluses.toList().sortedWith { o1: Bolus, o2: Bolus -> (o2.timestamp - o1.timestamp).toInt() })
         aapsLogger.debug(LTag.AUTOTUNE, "Nb Treatments: " + nsTreatments.size + " Nb meals: " + meals.size)
     }
 
diff --git a/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotunePlugin.kt b/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotunePlugin.kt
index 5f926c28c5..e379f22026 100644
--- a/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotunePlugin.kt
+++ b/app/src/main/java/info/nightscout/androidaps/plugins/general/autotune/AutotunePlugin.kt
@@ -76,21 +76,31 @@ class AutotunePlugin @Inject constructor(
     private lateinit var profile: Profile
     val autotuneStartHour: Int = 4
 
-    override fun aapsAutotune(daysBack: Int, autoSwitch: Boolean, profileToTune: String): String {
+    @Synchronized
+    override fun aapsAutotune(daysBack: Int, autoSwitch: Boolean, profileToTune: String) {
+        lastRunSuccess = false
+        calculationRunning = true
         tunedProfile = null
         updateButtonVisibility = View.GONE
-        lastRunSuccess = false
         var logResult = ""
         result = ""
         if (profileFunction.getProfile() == null) {
             result = rh.gs(R.string.profileswitch_ismissing)
-            return result
+            rxBus.send(EventAutotuneUpdateGui())
+            calculationRunning = false
+            return
         }
         val detailedLog = sp.getBoolean(R.string.key_autotune_additional_log, false)
         calculationRunning = true
         lastNbDays = "" + daysBack
         lastRun = dateUtil.now()
-        val profileStore = activePlugin.activeProfileSource.profile ?: return rh.gs(R.string.profileswitch_ismissing)
+        val profileStore = activePlugin.activeProfileSource.profile
+        if (profileStore == null) {
+            result = rh.gs(R.string.profileswitch_ismissing)
+            rxBus.send(EventAutotuneUpdateGui())
+            calculationRunning = false
+            return
+        }
         selectedProfile = if (profileToTune.isEmpty()) profileFunction.getProfileName() else profileToTune
         profileFunction.getProfile()?.let { currentProfile ->
             profile = profileStore.getSpecificProfile(profileToTune)?.let { ProfileSealed.Pure(it) } ?: currentProfile
@@ -144,11 +154,11 @@ class AutotunePlugin @Inject constructor(
             if (tunedProfile == null) {
                 result = rh.gs(R.string.autotune_error)
                 log("TunedProfile is null on day ${i + 1}")
-                calculationRunning = false
-                rxBus.send(EventAutotuneUpdateGui())
                 autotuneFS.exportResult(result)
                 autotuneFS.exportLogAndZip(lastRun)
-                return result
+                rxBus.send(EventAutotuneUpdateGui())
+                calculationRunning = false
+                return
             }
         }
         result = rh.gs(R.string.autotune_result, dateUtil.dateAndTimeString(lastRun))
@@ -193,13 +203,16 @@ class AutotunePlugin @Inject constructor(
         }
 
         tunedProfile?.let {
-            lastRunSuccess = true
             saveLastRun()
+            lastRunSuccess = true
             rxBus.send(EventAutotuneUpdateGui())
             calculationRunning = false
-            return result
+            return
         }
-        return rh.gs(R.string.autotune_error)
+        result = rh.gs(R.string.autotune_error)
+        rxBus.send(EventAutotuneUpdateGui())
+        calculationRunning = false
+        return
     }
 
     private fun showResults(tunedProfile: ATProfile?, pumpProfile: ATProfile): String {
diff --git a/core/src/main/java/info/nightscout/androidaps/interfaces/Autotune.kt b/core/src/main/java/info/nightscout/androidaps/interfaces/Autotune.kt
index b90934475e..83ebcd2530 100644
--- a/core/src/main/java/info/nightscout/androidaps/interfaces/Autotune.kt
+++ b/core/src/main/java/info/nightscout/androidaps/interfaces/Autotune.kt
@@ -2,7 +2,7 @@ package info.nightscout.androidaps.interfaces
 
 interface Autotune {
 
-    fun aapsAutotune(daysBack: Int, autoSwitch: Boolean, profileToTune: String = ""): String
+    fun aapsAutotune(daysBack: Int, autoSwitch: Boolean, profileToTune: String = "")
     fun atLog(message: String)
 
     var lastRunSuccess: Boolean