diff --git a/src/main/java/me/alex4386/plugin/typhon/volcano/lavaflow/VolcanoLavaFlow.java b/src/main/java/me/alex4386/plugin/typhon/volcano/lavaflow/VolcanoLavaFlow.java
index 2a14e50..fb77108 100644
--- a/src/main/java/me/alex4386/plugin/typhon/volcano/lavaflow/VolcanoLavaFlow.java
+++ b/src/main/java/me/alex4386/plugin/typhon/volcano/lavaflow/VolcanoLavaFlow.java
@@ -1289,12 +1289,17 @@ public void addRootlessCone(Location location, int height, boolean openVent) {
         int baseInt = (int) Math.ceil(baseRaw);
 
         boolean allowLavaFlow = !this.isShuttingDown;
+        int summitThreshold = this.vent.getSummitBlock().getY() - 10;
 
         // get circle around the base block
         List<Block> craterBlock = VolcanoMath.getCircle(baseBlock, height);
         double heightSum = 0;
         for (Block block : craterBlock) {
             Block highestBlock = TyphonUtils.getHighestRocklikes(block);
+            if (highestBlock.getY() + height > summitThreshold) {
+                return;
+            }
+
             heightSum += highestBlock.getY();
         }