diff --git a/project/frontend/src/components/pdfViewer.tsx b/project/frontend/src/components/pdfViewer.tsx
index 972f5f5..ee68c8d 100644
--- a/project/frontend/src/components/pdfViewer.tsx
+++ b/project/frontend/src/components/pdfViewer.tsx
@@ -10,8 +10,8 @@ import type {
 	OnGetTextSuccess,
 } from "node_modules/react-pdf/dist/esm/shared/types";
 import { socket } from "../socket";
-import { highlightPattern } from "../util/highlighting";
 import { API_HOST } from "../util/api";
+import { highlightPattern } from "../util/highlighting";
 
 interface PDFViewerProps {
 	pitchBookId: string;
@@ -111,7 +111,8 @@ export default function PDFViewer({
 					) {
 						for (
 							let k = textItems[i].i;
-							k < textItems[i + s.split(" ").length].i;
+							k < textItems[i + s.split(" ").length]?.i ||
+							k < textItems[i + s.split(" ").length - 1]?.i;
 							k++
 						) {
 							tmpPos.push(textContent[k].posKey);
@@ -129,7 +130,8 @@ export default function PDFViewer({
 					) {
 						for (
 							let k = textItems[i].i;
-							k < textItems[i + focusHighlight.text.split(" ").length].i;
+							k < textItems[i + focusHighlight.text.split(" ").length]?.i ||
+							k < textItems[i + focusHighlight.text.split(" ").length - 1]?.i;
 							k++
 						) {
 							tmpPosHighlight.push(textContent[k].posKey);