diff --git a/configuration/src/main/kotlin/com/malinskiy/marathon/config/LogicalConfigurationValidator.kt b/configuration/src/main/kotlin/com/malinskiy/marathon/config/LogicalConfigurationValidator.kt
index f734f7c6e..4eb016dd3 100644
--- a/configuration/src/main/kotlin/com/malinskiy/marathon/config/LogicalConfigurationValidator.kt
+++ b/configuration/src/main/kotlin/com/malinskiy/marathon/config/LogicalConfigurationValidator.kt
@@ -27,6 +27,9 @@ class LogicalConfigurationValidator : ConfigurationValidator {
             is VendorConfiguration.IOSConfiguration -> {
                 configuration.vendorConfiguration.validate()
             }
+            is VendorConfiguration.AndroidConfiguration -> {
+                configuration.vendorConfiguration.validate()
+            }
 
             else -> Unit
         }
diff --git a/configuration/src/main/kotlin/com/malinskiy/marathon/config/vendor/VendorConfiguration.kt b/configuration/src/main/kotlin/com/malinskiy/marathon/config/vendor/VendorConfiguration.kt
index ce1c01dc0..946d92f1e 100644
--- a/configuration/src/main/kotlin/com/malinskiy/marathon/config/vendor/VendorConfiguration.kt
+++ b/configuration/src/main/kotlin/com/malinskiy/marathon/config/vendor/VendorConfiguration.kt
@@ -72,6 +72,26 @@ sealed class VendorConfiguration {
         @JsonProperty("disableWindowAnimation") val disableWindowAnimation: Boolean = DEFAULT_DISABLE_WINDOW_ANIMATION,
     ) : VendorConfiguration() {
         fun safeAndroidSdk(): File = androidSdk ?: throw ConfigurationException("No android SDK path specified")
+
+        fun validate() {
+            validateFile(applicationOutput)
+            validateFile(testApplicationOutput)
+            splitApks?.forEach { validateFile(it) }
+            extraApplicationsOutput?.forEach { validateFile(it) }
+            outputs?.forEach {
+                validateFile(it.application)
+                validateFile(it.testApplication)
+                it.splitApks?.forEach { apk -> validateFile(apk) }
+                it.extraApplications?.forEach { apk -> validateFile(apk) }
+            }
+        }
+
+        private fun validateFile(file: File?) {
+            if (file != null) {
+                if (!file.exists()) throw ConfigurationException("${file.absolutePath} does not exist")
+                if (!file.isFile) throw ConfigurationException("${file.absolutePath} must be a regular file")
+            }
+        }
     }
 
     class AndroidConfigurationBuilder {
diff --git a/vendor/vendor-android/src/main/kotlin/com/malinskiy/marathon/android/adam/AdamDeviceProvider.kt b/vendor/vendor-android/src/main/kotlin/com/malinskiy/marathon/android/adam/AdamDeviceProvider.kt
index c8c8f242d..b9268cb38 100644
--- a/vendor/vendor-android/src/main/kotlin/com/malinskiy/marathon/android/adam/AdamDeviceProvider.kt
+++ b/vendor/vendor-android/src/main/kotlin/com/malinskiy/marathon/android/adam/AdamDeviceProvider.kt
@@ -67,6 +67,7 @@ class AdamDeviceProvider(
     private val socketFactory = VertxSocketFactory(idleTimeout = vendorConfiguration.timeoutConfiguration.socketIdleTimeout.toMillis())
     private val logcatManager: LogcatManager = LogcatManager()
     private lateinit var deviceEventsChannel: ReceiveChannel<Pair<AndroidDebugBridgeClient, List<Device>>>
+    private var deviceEventsChannelInitialized = false
     private val deviceEventsChannelMutex = Mutex()
     private val multiServerDeviceStateTracker = MultiServerDeviceStateTracker()
 
@@ -132,6 +133,7 @@ class AdamDeviceProvider(
                             }
                         }
                     }
+                    deviceEventsChannelInitialized = true
                 }
                 for ((client, currentDeviceList) in deviceEventsChannel) {
                     multiServerDeviceStateTracker.update(client, currentDeviceList).forEach { update ->
@@ -160,6 +162,7 @@ class AdamDeviceProvider(
                                     devices[serial] = ProvidedDevice(device, job)
                                 }
                             }
+
                             TrackingUpdate.DISCONNECTED -> {
                                 devices[serial]?.let { (device, job) ->
                                     if (job.isActive) {
@@ -169,6 +172,7 @@ class AdamDeviceProvider(
                                     device.dispose()
                                 }
                             }
+
                             TrackingUpdate.NOTHING_TO_DO -> Unit
                         }
                         logger.debug { "Device $serial changed state to $state" }
@@ -180,7 +184,7 @@ class AdamDeviceProvider(
 
     override suspend fun borrow(): AdamAndroidDevice {
         var availableDevices = devices.filter { it.value.setupJob.isCompleted && !it.value.setupJob.isCancelled }
-        while(availableDevices.isEmpty()) {
+        while (availableDevices.isEmpty()) {
             delay(200)
             availableDevices = devices.filter { it.value.setupJob.isCompleted && !it.value.setupJob.isCancelled }
         }
@@ -198,7 +202,9 @@ class AdamDeviceProvider(
         providerJob?.cancel()
         channel.close()
         deviceEventsChannelMutex.withLock {
-            deviceEventsChannel.cancel()
+            if (deviceEventsChannelInitialized) {
+                deviceEventsChannel.cancel()
+            }
         }
         logcatManager.close()
         socketFactory.close()