diff --git a/app/src/main/java/fr/gaulupeau/apps/Poche/service/IntentServiceBase.java b/app/src/main/java/fr/gaulupeau/apps/Poche/service/IntentServiceBase.java
index 69e101cb5..ab077e347 100644
--- a/app/src/main/java/fr/gaulupeau/apps/Poche/service/IntentServiceBase.java
+++ b/app/src/main/java/fr/gaulupeau/apps/Poche/service/IntentServiceBase.java
@@ -75,6 +75,9 @@ protected ActionResult processException(Exception e, String scope) {
             }
             // IOExceptions in most cases mean temporary error,
             // in some cases may mean that the action was completed anyway.
+        } else if(e instanceof IllegalArgumentException && !getSettings().isConfigurationOk()) {
+            result.setErrorType(ActionResult.ErrorType.INCORRECT_CONFIGURATION);
+            result.setMessage(e.toString());
         } else { // other exceptions meant to be handled outside
             result.setErrorType(ActionResult.ErrorType.UNKNOWN);
             result.setMessage(e.toString());
diff --git a/app/src/main/java/fr/gaulupeau/apps/Poche/service/MainService.java b/app/src/main/java/fr/gaulupeau/apps/Poche/service/MainService.java
index 5ade05888..2fe0df396 100644
--- a/app/src/main/java/fr/gaulupeau/apps/Poche/service/MainService.java
+++ b/app/src/main/java/fr/gaulupeau/apps/Poche/service/MainService.java
@@ -260,7 +260,7 @@ private Pair<ActionResult, Long> syncOfflineQueue(ActionRequest actionRequest) {
                     default:
                         throw new IllegalArgumentException("Unknown action: " + action);
                 }
-            } catch(IncorrectConfigurationException | UnsuccessfulResponseException | IOException e) {
+            } catch(IncorrectConfigurationException | UnsuccessfulResponseException | IOException | IllegalArgumentException e) {
                 ActionResult r = processException(e, "syncOfflineQueue()");
                 if(!r.isSuccess()) itemResult = r;
             } catch(Exception e) {