diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
index 1251ee2da..2357e0637 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/GradePresenter.kt
@@ -77,7 +77,7 @@ class GradePresenter @Inject constructor(
     }
 
     fun onPageSelected(index: Int) {
-        loadChild(index)
+        if (semesters.isNotEmpty()) loadChild(index)
     }
 
     fun onSwipeRefresh() {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
index 5e0ed2b2f..0d9a63511 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainActivity.kt
@@ -2,6 +2,8 @@ package io.github.wulkanowy.ui.modules.main
 
 import android.content.Context
 import android.content.Intent
+import android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK
+import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
@@ -165,7 +167,7 @@ class MainActivity : BaseActivity(), MainView {
 
     override fun openLoginView() {
         startActivity(LoginActivity.getStartIntent(this)
-            .apply { addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK) })
+            .apply { addFlags(FLAG_ACTIVITY_CLEAR_TASK or FLAG_ACTIVITY_NEW_TASK) })
     }
 
     override fun onSaveInstanceState(outState: Bundle?) {
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
index d1afd9c02..de4405b74 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/main/MainModule.kt
@@ -5,7 +5,6 @@ import dagger.Module
 import dagger.Provides
 import dagger.android.ContributesAndroidInjector
 import io.github.wulkanowy.R
-import io.github.wulkanowy.di.scopes.PerActivity
 import io.github.wulkanowy.di.scopes.PerFragment
 import io.github.wulkanowy.ui.modules.about.AboutFragment
 import io.github.wulkanowy.ui.modules.about.AboutModule
@@ -33,7 +32,6 @@ abstract class MainModule {
     companion object {
 
         @JvmStatic
-        @PerActivity
         @Provides
         fun provideFragNavController(activity: MainActivity): FragNavController {
             return FragNavController(activity.supportFragmentManager, R.id.mainFragmentContainer)