diff --git a/app/src/main/kotlin/at/bitfire/davdroid/ui/setup/SendInviteFragment.kt b/app/src/main/kotlin/at/bitfire/davdroid/ui/setup/SendInviteFragment.kt
index 89b7b340bf351d346a20465f87959087f1b5ed8e..2a8ee2ac20eb7e054ffa0beda77286530af53515 100644
--- a/app/src/main/kotlin/at/bitfire/davdroid/ui/setup/SendInviteFragment.kt
+++ b/app/src/main/kotlin/at/bitfire/davdroid/ui/setup/SendInviteFragment.kt
@@ -131,7 +131,12 @@ class SendInviteFragment : Fragment() {
             trimedResult.lastIndexOf(":") + 1,
             trimedResult.length - 1
         )
-        return errorCode.toInt()
+
+        return try {
+            errorCode.toInt()
+        } catch (e: NumberFormatException) {
+            -1
+        }
     }
 
     private fun handleErrorCode(intCode: Int) {