diff --git a/src/MaaCore/Task/Roguelike/RoguelikeConfig.cpp b/src/MaaCore/Task/Roguelike/RoguelikeConfig.cpp
index b9a045c6ff..8e86800cd8 100644
--- a/src/MaaCore/Task/Roguelike/RoguelikeConfig.cpp
+++ b/src/MaaCore/Task/Roguelike/RoguelikeConfig.cpp
@@ -20,7 +20,17 @@ bool asst::RoguelikeConfig::verify_and_load_params(const json::value& params)
 
     m_theme = theme;
     m_mode = mode;
-    m_difficulty = params.get("difficulty", 0);
+
+    if (m_theme != RoguelikeTheme::Phantom) {
+        m_difficulty = params.get("difficulty", 0);
+    }
+    else if (params.contains("difficulty")) {
+        Log.error(__FUNCTION__, "| Invalid difficulty for theme", m_theme);
+        return false;
+    }
+    else {
+        m_difficulty = 1;
+    }
 
     m_start_with_elite_two = params.get("start_with_elite_two", false);
     m_only_start_with_elite_two = params.get("only_start_with_elite_two", false);