Fix crash in f-droid build

app/src/main/java/org/tasks/preferences/fragments/HelpAndFeedback.kt

@@ -74,12 +74,14 @@ class HelpAndFeedback : InjectingPreferenceFragment() {
     override fun onResume() {
         super.onResume()
 
+        if (BuildConfig.FLAVOR != "generic") {
             val findPreference = findPreference(R.string.upgrade_to_pro)
             if (inventory.hasPro()) {
                 findPreference.title = getString(R.string.manage_subscription)
                 findPreference.summary = getString(R.string.manage_subscription_summary)
             }
         }
+    }
 
     override fun getMenu() = 0
 }