Fix joining public chat crashing.

src/org/thoughtcrime/securesms/loki/redesign/activities/JoinPublicChatActivity.kt

@@ -18,9 +18,9 @@ import nl.komponents.kovenant.ui.failUi
 import nl.komponents.kovenant.ui.successUi
 import org.thoughtcrime.securesms.BaseActionBarActivity
 import org.thoughtcrime.securesms.PassphraseRequiredActionBarActivity
-import org.thoughtcrime.securesms.loki.redesign.utilities.OpenGroupUtilities
 import org.thoughtcrime.securesms.loki.redesign.fragments.ScanQRCodeWrapperFragment
 import org.thoughtcrime.securesms.loki.redesign.fragments.ScanQRCodeWrapperFragmentDelegate
+import org.thoughtcrime.securesms.loki.redesign.utilities.OpenGroupUtilities
 import org.thoughtcrime.securesms.sms.MessageSender
 
 class JoinPublicChatActivity : PassphraseRequiredActionBarActivity(), ScanQRCodeWrapperFragmentDelegate {
@@ -62,8 +62,10 @@ class JoinPublicChatActivity : PassphraseRequiredActionBarActivity(), ScanQRCode
     }
 
     fun joinPublicChatIfPossible(url: String) {
+        runOnUiThread {
             if (!Patterns.WEB_URL.matcher(url).matches() || !url.startsWith("https://")) {
-            return Toast.makeText(this, "Invalid URL", Toast.LENGTH_SHORT).show()
+                Toast.makeText(this, "Invalid URL", Toast.LENGTH_SHORT).show()
+                return@runOnUiThread
             }
             showLoader()
 
@@ -77,6 +79,7 @@ class JoinPublicChatActivity : PassphraseRequiredActionBarActivity(), ScanQRCode
                 Toast.makeText(this, "Couldn't join channel", Toast.LENGTH_SHORT).show()
             }
         }
+    }
     // endregion
 }