diff --git a/graph.cpp b/graph.cpp
index 4893b548..ac57ee3c 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -3079,6 +3079,7 @@ bool has_nice_dual() {
   if(!nonbitrunc) return true;
   if((S7 & 1) == 0) return true;
   if(!gp::on) return false;
+  if(a4) return false;
   return (gp::param.first + gp::param.second * 2) % 3 == 0;
   }
 
diff --git a/landlock.cpp b/landlock.cpp
index c6f064d9..4eec6f6a 100644
--- a/landlock.cpp
+++ b/landlock.cpp
@@ -1156,6 +1156,9 @@ land_validity_t& land_validity(eLand l) {
   if(l == laWhirlpool && a4)
     return dont_work;
 
+  if(isWarped(l) && a4 && gp::on)
+    return dont_work;
+  
   // equidistant-based lands
   if(isEquidLand(l)) {
     // no equidistants supported in chaos mode