Prevent errors when extracting textContent with zero initial font size (issue 22381)

src/core/evaluator.js

@@ -2982,7 +2982,7 @@ class PartialEvaluator {
         currentTextState !== textState &&
         (currentTextState.fontSize !== textState.fontSize ||
           (currentTextState.fontName !== textState.fontName &&
-            (currentTextState.font.name !== textState.font.name ||
+            (currentTextState.font?.name !== textState.font.name ||
               currentTextState.font.vertical !== textState.font.vertical)))
       ) {
         flushTextContentItem();

test/pdfs/.gitignore

@@ -157,6 +157,7 @@
 !issue14023.pdf
 !issue14438.pdf
 !issue14999_reduced.pdf
+!issue22381.pdf
 !bad-PageLabels.pdf
 !decodeACSuccessive.pdf
 !issue13003.pdf

test/unit/api_spec.js

@@ -5600,6 +5600,19 @@ have written that much by now. So, here’s to squashing bugs.`);
       await loadingTask.destroy();
     });
 
+    it("gets text content with zero initial font size (issue 22381)", async function () {
+      const loadingTask = getDocument(buildGetDocumentParams("issue22381.pdf"));
+      const pdfDoc = await loadingTask.promise;
+      const pdfPage = await pdfDoc.getPage(1);
+      const { items } = await pdfPage.getTextContent({
+        disableNormalization: true,
+      });
+      const text = mergeText(items);
+      expect(text).toEqual("hiddenVisible text");
+
+      await loadingTask.destroy();
+    });
+
     it("gets empty structure tree", async function () {
       const tree = await page.getStructTree();