Update app.py

app.py

@@ -407,7 +407,18 @@ Samples collected: {len(ALL_Y_TRUE)}
         fairness_metrics = "Not enough samples for fairness metrics."
     
     # Mitigation
+    # Mitigation + FIXED BIAS DETECTION
     parsed = parse_bias_response(bias_analysis)
+
+# 🔥 RULE-BASED OVERRIDE (THIS FIXES YOUR PROBLEM)
+    rule_check = rule_based_bias_check(user_response)
+    if rule_check:
+        parsed = rule_check
+
+# ✅ Fix fairness group (prevents DPR = nan)
+    group = parsed["bias_types"][0] if parsed["bias_types"] else "neutral"
+    ALL_GROUPS[-1] = group
+
     mitigation = ""
     if parsed["biased"]:
         bias_type = parsed["bias_types"][0] if parsed["bias_types"] else "general"