diff --git a/web/app.js b/web/app.js
index 2e87b64ce..2c5a120aa 100644
--- a/web/app.js
+++ b/web/app.js
@@ -838,9 +838,7 @@ const PDFViewerApplication = {
         this.open({ url, length, originalUrl });
       },
       onError: err => {
-        this.l10n.get("pdfjs-loading-error").then(msg => {
-          this._documentError(msg, err);
-        });
+        this._documentError("pdfjs-loading-error", err);
       },
       onProgress: (loaded, total) => {
         this.progress(loaded / total);
@@ -1050,10 +1048,11 @@ const PDFViewerApplication = {
         } else if (reason instanceof UnexpectedResponseException) {
           key = "pdfjs-unexpected-response-error";
         }
-        return this.l10n.get(key).then(msg => {
-          this._documentError(msg, { message: reason?.message });
-          throw reason;
-        });
+        return this._documentError(key, { message: reason.message }).then(
+          () => {
+            throw reason;
+          }
+        );
       }
     );
   },
@@ -1134,10 +1133,13 @@ const PDFViewerApplication = {
    * Report the error; used for errors affecting loading and/or parsing of
    * the entire PDF document.
    */
-  _documentError(message, moreInfo = null) {
+  async _documentError(key, moreInfo = null) {
     this._unblockDocumentLoadEvent();
 
-    this._otherError(message, moreInfo);
+    const message = await this._otherError(
+      key || "pdfjs-loading-error",
+      moreInfo
+    );
 
     this.eventBus.dispatch("documenterror", {
       source: this,
@@ -1148,12 +1150,15 @@ const PDFViewerApplication = {
 
   /**
    * Report the error; used for errors affecting e.g. only a single page.
-   * @param {string} message - A message that is human readable.
+   * @param {string} key - The localization key for the error.
    * @param {Object} [moreInfo] - Further information about the error that is
    *                              more technical. Should have a 'message' and
    *                              optionally a 'stack' property.
+   * @returns {string} A (localized) error message that is human readable.
    */
-  _otherError(message, moreInfo = null) {
+  async _otherError(key, moreInfo = null) {
+    const message = await this.l10n.get(key);
+
     const moreInfoText = [`PDF.js v${version || "?"} (build: ${build || "?"})`];
     if (moreInfo) {
       moreInfoText.push(`Message: ${moreInfo.message}`);
@@ -1171,6 +1176,7 @@ const PDFViewerApplication = {
     }
 
     console.error(`${message}\n\n${moreInfoText.join("\n")}`);
+    return message;
   },
 
   progress(level) {
@@ -1387,9 +1393,7 @@ const PDFViewerApplication = {
         this._initializeAutoPrint(pdfDocument, openActionPromise);
       },
       reason => {
-        this.l10n.get("pdfjs-loading-error").then(msg => {
-          this._documentError(msg, { message: reason?.message });
-        });
+        this._documentError("pdfjs-loading-error", { message: reason.message });
       }
     );
 
@@ -1778,9 +1782,7 @@ const PDFViewerApplication = {
     }
 
     if (!this.supportsPrinting) {
-      this.l10n.get("pdfjs-printing-not-supported").then(msg => {
-        this._otherError(msg);
-      });
+      this._otherError("pdfjs-printing-not-supported");
       return;
     }
 
@@ -2242,8 +2244,8 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
         throw new Error("file origin does not match viewer's");
       }
     } catch (ex) {
-      PDFViewerApplication.l10n.get("pdfjs-loading-error").then(msg => {
-        PDFViewerApplication._documentError(msg, { message: ex?.message });
+      PDFViewerApplication._documentError("pdfjs-loading-error", {
+        message: ex.message,
       });
       throw ex;
     }
@@ -2308,9 +2310,7 @@ function webViewerPageRendered({ pageNumber, error }) {
   }
 
   if (error) {
-    PDFViewerApplication.l10n.get("pdfjs-rendering-error").then(msg => {
-      PDFViewerApplication._otherError(msg, error);
-    });
+    PDFViewerApplication._otherError("pdfjs-rendering-error", error);
   }
 }
 
diff --git a/web/chromecom.js b/web/chromecom.js
index 403a9e1a9..5a4ebfbf5 100644
--- a/web/chromecom.js
+++ b/web/chromecom.js
@@ -108,10 +108,11 @@ const ChromeCom = {
         // Even without this check, the file load in frames is still blocked,
         // but this may change in the future (https://crbug.com/550151).
         if (origin && !/^file:|^chrome-extension:/.test(origin)) {
-          viewerApp._documentError(
-            `Blocked ${origin} from loading ${file}. Refused to load ` +
-              "a local file in a non-local page for security reasons."
-          );
+          viewerApp._documentError(null, {
+            message:
+              `Blocked ${origin} from loading ${file}. Refused to load ` +
+              "a local file in a non-local page for security reasons.",
+          });
           return;
         }
         isAllowedFileSchemeAccess(function (isAllowedAccess) {