user agent if Endpoint is not started yet

lib/pleroma/application.ex

@@ -22,13 +22,18 @@ defmodule Pleroma.Application do
   def repository, do: @repository
 
   def user_agent do
-    case Config.get([:http, :user_agent], :default) do
-      :default ->
-        info = "#{Pleroma.Web.base_url()} <#{Config.get([:instance, :email], "")}>"
-        named_version() <> "; " <> info
-
-      custom ->
-        custom
+    if Process.whereis(Pleroma.Web.Endpoint) do
+      case Config.get([:http, :user_agent], :default) do
+        :default ->
+          info = "#{Pleroma.Web.base_url()} <#{Config.get([:instance, :email], "")}>"
+          named_version() <> "; " <> info
+
+        custom ->
+          custom
+      end
+    else
+      # fallback, if endpoint is not started yet
+      "Pleroma Data Loader"
     end
   end