diff --git a/CHANGES.md b/CHANGES.md
index 4100031b36..e922bec768 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,14 @@
+Changes in RiotX 0.14.3 (2020-02-03)
+===================================================
+
+Bugfix 🐛:
+ - Fix Exception in DeviceListManager
+
 Changes in RiotX 0.14.2 (2020-02-02)
 ===================================================
 
-Fix RiotX not starting issue
+Bugfix 🐛:
+ - Fix RiotX not starting issue
 
 Changes in RiotX 0.14.1 (2020-02-02)
 ===================================================
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DeviceListManager.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DeviceListManager.kt
index bc5add34a1..87b2093e2d 100755
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DeviceListManager.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DeviceListManager.kt
@@ -319,10 +319,11 @@ internal class DeviceListManager @Inject constructor(private val cryptoStore: IM
         for (userId in filteredUsers) {
             // al devices =
             val models = response.deviceKeys?.get(userId)?.mapValues { entry -> CryptoInfoMapper.map(entry.value) }
-                    ?.toMutableMap()
+
 
             Timber.v("## doKeyDownloadForUsers() : Got keys for $userId : $models")
             if (!models.isNullOrEmpty()) {
+                val workingCopy = models.toMutableMap()
                 for ((deviceId, deviceInfo) in models) {
                     // Get the potential previously store device keys for this device
                     val previouslyStoredDeviceKeys = cryptoStore.getUserDevice(userId, deviceId)
@@ -335,21 +336,21 @@ internal class DeviceListManager @Inject constructor(private val cryptoStore: IM
                     // Validate received keys
                     if (!validateDeviceKeys(deviceInfo, userId, deviceId, previouslyStoredDeviceKeys)) {
                         // New device keys are not valid. Do not store them
-                        models.remove(deviceId)
+                        workingCopy.remove(deviceId)
                         if (null != previouslyStoredDeviceKeys) {
                             // But keep old validated ones if any
-                            models[deviceId] = previouslyStoredDeviceKeys
+                            workingCopy[deviceId] = previouslyStoredDeviceKeys
                         }
                     } else if (null != previouslyStoredDeviceKeys) {
                         // The verified status is not sync'ed with hs.
                         // This is a client side information, valid only for this client.
                         // So, transfer its previous value
-                        models[deviceId]!!.trustLevel = previouslyStoredDeviceKeys.trustLevel
+                        workingCopy[deviceId]!!.trustLevel = previouslyStoredDeviceKeys.trustLevel
                     }
                 }
                 // Update the store
                 // Note that devices which aren't in the response will be removed from the stores
-                cryptoStore.storeUserDevices(userId, models)
+                cryptoStore.storeUserDevices(userId, workingCopy)
             }
 
             // Handle cross signing keys update
diff --git a/vector/build.gradle b/vector/build.gradle
index 6321b5c4ec..96744ec224 100644
--- a/vector/build.gradle
+++ b/vector/build.gradle
@@ -16,7 +16,7 @@ androidExtensions {
 
 ext.versionMajor = 0
 ext.versionMinor = 14
-ext.versionPatch = 2
+ext.versionPatch = 3
 
 static def getGitTimestamp() {
     def cmd = 'git show -s --format=%ct'