diff --git a/vector/src/main/java/im/vector/app/core/platform/VectorViewModel.kt b/vector/src/main/java/im/vector/app/core/platform/VectorViewModel.kt
index 002dfcf068..d6f43beaf7 100644
--- a/vector/src/main/java/im/vector/app/core/platform/VectorViewModel.kt
+++ b/vector/src/main/java/im/vector/app/core/platform/VectorViewModel.kt
@@ -43,7 +43,7 @@ abstract class VectorViewModel<S : MvRxState, VA : VectorViewModelAction, VE : V
      * so you can use this in a switchMap or a flatMap
      */
     // False positive
-    @Suppress("USELESS_CAST")
+    @Suppress("USELESS_CAST", "NULLABLE_TYPE_PARAMETER_AGAINST_NOT_NULL_TYPE_PARAMETER")
     fun <T> Single<T>.toAsync(stateReducer: S.(Async<T>) -> S): Single<Async<T>> {
         setState { stateReducer(Loading()) }
         return map { Success(it) as Async<T> }
@@ -56,7 +56,7 @@ abstract class VectorViewModel<S : MvRxState, VA : VectorViewModelAction, VE : V
      * so you can use this in a switchMap or a flatMap
      */
     // False positive
-    @Suppress("USELESS_CAST")
+    @Suppress("USELESS_CAST", "NULLABLE_TYPE_PARAMETER_AGAINST_NOT_NULL_TYPE_PARAMETER")
     fun <T> Observable<T>.toAsync(stateReducer: S.(Async<T>) -> S): Observable<Async<T>> {
         setState { stateReducer(Loading()) }
         return map { Success(it) as Async<T> }
diff --git a/vector/src/main/java/im/vector/app/core/utils/DataSource.kt b/vector/src/main/java/im/vector/app/core/utils/DataSource.kt
index 8a908ad1d4..06bdeb9277 100644
--- a/vector/src/main/java/im/vector/app/core/utils/DataSource.kt
+++ b/vector/src/main/java/im/vector/app/core/utils/DataSource.kt
@@ -44,7 +44,7 @@ open class BehaviorDataSource<T>(private val defaultValue: T? = null) : MutableD
     }
 
     override fun post(value: T) {
-        behaviorRelay.accept(value)
+        behaviorRelay.accept(value!!)
     }
 
     private fun createRelay(): BehaviorRelay<T> {
@@ -68,6 +68,6 @@ open class PublishDataSource<T> : MutableDataSource<T> {
     }
 
     override fun post(value: T) {
-        publishRelay.accept(value)
+        publishRelay.accept(value!!)
     }
 }