diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
index cbf3b63ce..51285969c 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/luckynumberwidget/LuckyNumberWidgetProvider.kt
@@ -104,7 +104,7 @@ class LuckyNumberWidgetProvider : BroadcastReceiver() {
                                         .toMaybe()
                                         .doOnSuccess { sharedPref.putLong(getStudentWidgetKey(appWidgetId), it.id) }
                                 }
-                                else -> null
+                                else -> Maybe.empty()
                             }
                         }
                 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
index 2b748760a..9b35e5cae 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetablewidget/TimetableWidgetProvider.kt
@@ -165,7 +165,7 @@ class TimetableWidgetProvider : BroadcastReceiver() {
                                         .toMaybe()
                                         .doOnSuccess { sharedPref.putLong(getStudentWidgetKey(appWidgetId), it.id) }
                                 }
-                                else -> null
+                                else -> Maybe.empty()
                             }
                         }
                 }
diff --git a/build.gradle b/build.gradle
index ac6bde63f..1321c5f4c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ buildscript {
     }
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.android.tools.build:gradle:3.4.0'
+        classpath 'com.android.tools.build:gradle:3.4.1'
         classpath 'com.google.gms:google-services:4.2.0'
         classpath "io.fabric.tools:gradle:1.28.1"
         classpath "com.github.triplet.gradle:play-publisher:2.2.0"