diff --git a/src/main/java/com/seibel/lod/core/util/DataPointUtil.java b/src/main/java/com/seibel/lod/core/util/DataPointUtil.java
index 0a0d52425..81b11c287 100644
--- a/src/main/java/com/seibel/lod/core/util/DataPointUtil.java
+++ b/src/main/java/com/seibel/lod/core/util/DataPointUtil.java
@@ -378,8 +378,7 @@ public class DataPointUtil
 								//only top is within some exiting block, extending it
 								topPos++; //to make it easier
 								heightAndDepth[topPos * 2] = height;
-								short temp = heightAndDepth[botPos * 2 + 1];
-								heightAndDepth[topPos * 2 + 1] = temp;
+								heightAndDepth[topPos * 2 + 1] = heightAndDepth[botPos * 2 + 1];
 								shrinkArray(heightAndDepth, 2, topPos + 1, botPos - topPos, count);
 								count -= botPos - topPos;
 							}
diff --git a/src/main/java/com/seibel/lod/core/util/ThreadMapUtil.java b/src/main/java/com/seibel/lod/core/util/ThreadMapUtil.java
index f2bc10781..43f2fd078 100644
--- a/src/main/java/com/seibel/lod/core/util/ThreadMapUtil.java
+++ b/src/main/java/com/seibel/lod/core/util/ThreadMapUtil.java
@@ -178,6 +178,7 @@ public class ThreadMapUtil
 		{
 			heightAndDepthMap.put(Thread.currentThread().getName(), new short[arrayLength]);
 		}
+		Arrays.fill(heightAndDepthMap.get(Thread.currentThread().getName()), Short.MIN_VALUE);
 		return heightAndDepthMap.get(Thread.currentThread().getName());
 	}