bug fix

app/src/main/java/chat/rocket/android/profile/ui/ProfileFragment.kt

 package chat.rocket.android.profile.ui
 
 import DrawableHelper
+import android.app.Activity
 import android.os.Build
 import android.os.Bundle
 import android.support.v4.app.Fragment
+import android.support.v7.app.AppCompatActivity
 import android.support.v7.view.ActionMode
 import android.view.*
 import chat.rocket.android.R
@@ -17,6 +19,7 @@ import io.reactivex.rxkotlin.Observables
 import kotlinx.android.synthetic.main.app_bar.*
 import kotlinx.android.synthetic.main.avatar_profile.*
 import kotlinx.android.synthetic.main.fragment_profile.*
+import timber.log.Timber
 import javax.inject.Inject
 
 class ProfileFragment : Fragment(), ProfileView, ActionMode.Callback {
@@ -135,7 +138,7 @@ class ProfileFragment : Fragment(), ProfileView, ActionMode.Callback {
     }
 
     private fun setupToolbar() {
-        (activity as MainActivity).toolbar.title = getString(R.string.title_profile)
+        (activity as AppCompatActivity?)?.supportActionBar?.title = getString(R.string.title_profile)
     }
 
     private fun tintEditTextDrawableStart() {

app/src/main/java/chat/rocket/android/settings/ui/SettingsFragment.kt

@@ -47,7 +47,7 @@ class SettingsFragment: Fragment(), SettingsView, AdapterView.OnItemClickListene
     }
 
     private fun setupToolbar() {
-        (activity as MainActivity).toolbar.title = getString(R.string.title_settings)
+        (activity as AppCompatActivity?)?.supportActionBar?.title = getString(R.string.title_settings)
     }
 
     private fun startNewActivity(classType: KClass<out AppCompatActivity>) {