diff --git a/Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/IndexMap.java b/Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/IndexMap.java
index 16be6a791a..cc5e792d65 100644
--- a/Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/IndexMap.java
+++ b/Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/IndexMap.java
@@ -175,7 +175,7 @@ public class IndexMap {
 	 * except for the last line of a block which may end part way in the line.
 	 */
 	int getLastActiveFactoryIndex(BigInteger index, FieldFactory[] factories) {
-		for (int i = factories.length - 1; i > 0; i--) {
+		for (int i = factories.length - 1; i >= 0; i--) {
 			if (factories[i].isActive(index)) {
 				return i;
 			}