diff --git a/web/js/uoj.js b/web/js/uoj.js
index cec7c0e..c4f2332 100644
--- a/web/js/uoj.js
+++ b/web/js/uoj.js
@@ -1291,53 +1291,55 @@ $(document).ready(function() {
 			);
 	});
 
-	$LAB.script('/js/pdf.js').wait(function() {
-		pdfjsLib.GlobalWorkerOptions.workerSrc = '/js/pdf.worker.js';
+	if ($('div[data-pdf]').length > 0) {
+		$LAB.script('/js/pdf.js').wait(function() {
+			pdfjsLib.GlobalWorkerOptions.workerSrc = '/js/pdf.worker.js';
 
-		// Support HiDPI-screens.
-		var outputScale = window.devicePixelRatio || 1;
+			// Support HiDPI-screens.
+			var outputScale = window.devicePixelRatio || 1;
 
-		$('div[data-pdf]').each(function() {
-			var _this = $(this);
-			var pdf_src = $(this).data('src');
+			$('div[data-pdf]').each(function() {
+				var _this = $(this);
+				var pdf_src = $(this).data('src');
 
-			$(this).css('width', '100%').css('height', '100%');
+				$(this).css('width', '100%').css('height', '100%');
 
-			var task = pdfjsLib.getDocument(pdf_src);
-			var id = 'pdf_' + task.docId;
+				var task = pdfjsLib.getDocument(pdf_src);
+				var id = 'pdf_' + task.docId;
 
-			$(this).attr('id', id + '_container');
+				$(this).attr('id', id + '_container');
 
-			task.promise.then(function(pdf) {
-				for (var i = 1; i <= pdf.numPages; i++) {
-					$(_this).append('<canvas id="' + id + '_page_' + i + '" class="pdf-page-canvas"></canvas>');
+				task.promise.then(function(pdf) {
+					for (var i = 1; i <= pdf.numPages; i++) {
+						$(_this).append('<canvas id="' + id + '_page_' + i + '" class="pdf-page-canvas"></canvas>');
 
-					pdf.getPage(i).then(function(page) {
-						var viewport = page.getViewport({
-							scale: 2.5,
+						pdf.getPage(i).then(function(page) {
+							var viewport = page.getViewport({
+								scale: 2.5,
+							});
+
+							var canvas = document.getElementById(id + '_page_' + page.pageNumber);
+
+							canvas.height = Math.floor(viewport.height * outputScale);
+							canvas.width = Math.floor(viewport.width * outputScale);
+
+							var transform = outputScale !== 1
+								? [outputScale, 0, 0, outputScale, 0, 0]
+								: null;
+
+							page.render({
+								canvasContext: canvas.getContext('2d'),
+								viewport: viewport,
+								transform: transform,
+							});
 						});
+					}
 
-						var canvas = document.getElementById(id + '_page_' + page.pageNumber);
-
-						canvas.height = Math.floor(viewport.height * outputScale);
-						canvas.width = Math.floor(viewport.width * outputScale);
-
-						var transform = outputScale !== 1
-							? [outputScale, 0, 0, outputScale, 0, 0]
-							: null;
-
-						page.render({
-							canvasContext: canvas.getContext('2d'),
-							viewport: viewport,
-							transform: transform,
-						});
-					});
-				}
-
-				$('.uoj-pdf-loading-spinner', _this).remove();
+					$('.uoj-pdf-loading-spinner', _this).remove();
+				});
 			});
 		});
-	});
+	}
 });
 
 // Tooltip