diff --git a/core/src/main/java/com/seibel/lod/core/dataObjects/transformers/LodDataBuilder.java b/core/src/main/java/com/seibel/lod/core/dataObjects/transformers/LodDataBuilder.java
index 6ec621eda..3fa4f65b7 100644
--- a/core/src/main/java/com/seibel/lod/core/dataObjects/transformers/LodDataBuilder.java
+++ b/core/src/main/java/com/seibel/lod/core/dataObjects/transformers/LodDataBuilder.java
@@ -26,11 +26,18 @@ public class LodDataBuilder {
                 int mappedId = chunkData.getMapping().addIfNotPresentAndGetId(biome, blockState);
                 // FIXME: The +1 offset to reproduce the old behavior. Remove this when we get per-face lighting
                 byte light = (byte) ((chunkWrapper.getBlockLight(x,lastY+1,z) << 4) + chunkWrapper.getSkyLight(x,lastY+1,z));
+
                 int y=chunkWrapper.getLightBlockingHeightMapValue(x, z);
+                int top = y;
 
                 for (; y>=chunkWrapper.getMinBuildHeight(); y--) {
                     IBiomeWrapper newBiome = chunkWrapper.getBiome(x, y, z);
                     IBlockStateWrapper newBlockState = chunkWrapper.getBlockState(x, y, z);
+
+                    if (top == 30 && y == 29 && chunkWrapper.getSkyLight(x,y+1,z) == 0)
+                    {
+                        int a = 0;
+                    }
                     byte newLight = (byte) ((chunkWrapper.getBlockLight(x,y+1,z) << 4) + chunkWrapper.getSkyLight(x,y+1,z));
 
                     if (!newBiome.equals(biome) || !newBlockState.equals(blockState)) {
@@ -52,6 +59,7 @@ public class LodDataBuilder {
                 chunkData.setSingleColumn(longs.toArray(new long[0]), x, z);
             }
         }
+        if (!canGenerateLodFromChunk(chunkWrapper)) return null;
         LodUtil.assertTrue(chunkData.emptyCount() == 0);
         return chunkData;
     }
diff --git a/core/src/main/java/com/seibel/lod/core/render/glObject/GLProxy.java b/core/src/main/java/com/seibel/lod/core/render/glObject/GLProxy.java
index c241a6f18..000a7ba97 100644
--- a/core/src/main/java/com/seibel/lod/core/render/glObject/GLProxy.java
+++ b/core/src/main/java/com/seibel/lod/core/render/glObject/GLProxy.java
@@ -28,6 +28,7 @@ import java.util.concurrent.TimeUnit;
 import com.seibel.lod.core.config.Config;
 import com.seibel.lod.core.logging.ConfigBasedLogger;
 import com.seibel.lod.core.logging.DhLoggerBuilder;
+import com.seibel.lod.core.util.LodUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.lwjgl.glfw.GLFW;
@@ -457,7 +458,7 @@ public class GLProxy
 				"Vertex Attribute Buffer Binding: " + (c.glVertexAttribBinding != 0) + " <- optional improvement\n" +
 				"Buffer Storage: " + (c.glBufferStorage != 0) + " <- optional improvement\n";
 	}
-	
+
 	private static void logMessage(GLMessage msg)
 	{
 		GLMessage.ESeverity s = msg.severity;
@@ -465,6 +466,7 @@ public class GLProxy
 			msg.type == GLMessage.EType.UNDEFINED_BEHAVIOR)
 		{
 			GL_LOGGER.error("GL ERROR {} from {}: {}", msg.id, msg.source, msg.message);
+			LodUtil.assertNotReach();
 			throw new RuntimeException("GL ERROR: " + msg.toString());
 		}
 		
diff --git a/core/src/main/java/com/seibel/lod/core/render/renderer/LodRenderer.java b/core/src/main/java/com/seibel/lod/core/render/renderer/LodRenderer.java
index 78cad9ddb..e7f6bc91e 100644
--- a/core/src/main/java/com/seibel/lod/core/render/renderer/LodRenderer.java
+++ b/core/src/main/java/com/seibel/lod/core/render/renderer/LodRenderer.java
@@ -83,6 +83,7 @@ public class LodRenderer
 		shaderProgram.bindVertexBuffer(vbo.getId());
 		GL32.glDrawElements(GL32.GL_TRIANGLES, (vbo.getVertexCount()/4)*6,
 				quadIBO.getType(), 0);
+		vbo.unbind();
 	}
 	public Vec3f getLookVector() {
 		return MC_RENDER.getLookAtVector();
diff --git a/core/src/main/java/com/seibel/lod/core/util/LodUtil.java b/core/src/main/java/com/seibel/lod/core/util/LodUtil.java
index 23ea22372..a3eb4585d 100644
--- a/core/src/main/java/com/seibel/lod/core/util/LodUtil.java
+++ b/core/src/main/java/com/seibel/lod/core/util/LodUtil.java
@@ -266,8 +266,8 @@ public class LodUtil
 			debugBreak();
 		}
 	}
-	
-	private static void debugBreak() {
+
+	public static void debugBreak() {
 		int a = 0; // Set breakpoint here for auto pause on assert failure
 	}