diff --git a/lib/QuipProcessor.js b/lib/QuipProcessor.js
index dd5283e..1277cff 100644
--- a/lib/QuipProcessor.js
+++ b/lib/QuipProcessor.js
@@ -261,14 +261,18 @@ class QuipProcessor {
                         threadId: quipThread.thread.id,
                         blobId: file.hash
                     };
-
-                    if(Mime.getType(file.name).startsWith('image/')) {
+                    const mimeType = Mime.getType(file.name);
+                    if(mimeType && mimeType.startsWith('image/')) {
                         //image
                         const imageHtml = `<br/><img class='message--image' src='RELATIVE_PATH'></img><br/>`;
                         text += await this._processFile(imageHtml, fileMatch, path, this.options.embeddedImages);
                     } else {
                         //file
-                        const fileHtml = `<br/><a href="RELATIVE_PATH">${file.name}</a><br/>`;
+                        let fileName = file.name;
+                        if(!fileName) {
+                            fileName = file.hash;
+                        }
+                        const fileHtml = `<br/><a href="RELATIVE_PATH">${fileName}</a><br/>`;
                         text += await this._processFile(fileHtml, fileMatch, path);
                     }
 
diff --git a/lib/__tests__/QuipProcessor.test.js b/lib/__tests__/QuipProcessor.test.js
index 7f874e4..034917a 100644
--- a/lib/__tests__/QuipProcessor.test.js
+++ b/lib/__tests__/QuipProcessor.test.js
@@ -903,10 +903,10 @@ describe('methods tests', () => {
 
             quipProcessor._processFile = jest.fn();
             quipProcessor._processFile.mockImplementation((html, fileMatch) => {
-                if(fileMatch.blobId === '1c2EXOl1sx04g5_hPNmt1A') {
-                    return Promise.resolve(html + 'PROCESSED-FILE');
-                }
-                if(fileMatch.blobId === 'sVhMwHaxsgiwmfMi4au1Zg') {
+                if(['1c2EXOl1sx04g5_hPNmt1A',
+                    'sVhMwHaxsgiwmfMi4au1Zg',
+                    '1c2EXOl1sx04g5_hPNmt1A222',
+                    'sVhMwHaxsgiwmfMi4au1Zg111'].includes(fileMatch.blobId)) {
                     return Promise.resolve(html + 'PROCESSED-FILE');
                 }
                 if(fileMatch.blobId === 'Ak5BJnkWubPxpIm4dtlWmg') {
diff --git a/lib/__tests__/QuipService.test.js b/lib/__tests__/QuipService.test.js
index 1169c72..617ddcd 100644
--- a/lib/__tests__/QuipService.test.js
+++ b/lib/__tests__/QuipService.test.js
@@ -31,6 +31,11 @@ response200Blob.blob = jest.fn(() => blob);
 
 const quipService = new QuipService('###TOKEN###', 'http://quip.com');
 
+beforeEach(() => {
+    quipService.stats.query_count = 0;
+    quipService.querries503 = new Map();
+});
+
 test('constructor tests', async () => {
     expect(quipService.accessToken).toBe('###TOKEN###');
     expect(quipService.apiURL).toBe('http://quip.com');
@@ -38,7 +43,6 @@ test('constructor tests', async () => {
 });
 
 test('_apiCall response with 503 code', async () => {
-    quipService.stats.query_count = 0;
     fetch.mockReturnValue(Promise.resolve(response200)).mockReturnValueOnce(Promise.resolve(response503));
     const res = await quipService._apiCall('/someURL');
     expect(res.data).toBe(123456);
@@ -46,7 +50,6 @@ test('_apiCall response with 503 code', async () => {
 });
 
 test('_apiCall response with 503 code more than 10 times', async () => {
-    quipService.stats.query_count = 0;
     fetch.mockReturnValue(Promise.resolve(response503));
     const res = await quipService._apiCall('/someURL');
     expect(res).toBe(undefined);
@@ -69,7 +72,6 @@ test('_apiCall: fetch with exeption', async () => {
 });
 
 test('_apiCallBlob response with 503 code', async () => {
-    quipService.stats.query_count = 0;
     fetch.mockReturnValue(Promise.resolve(response200Blob)).mockReturnValueOnce(Promise.resolve(response503));
     const res = await quipService._apiCallBlob('/someURL');
     expect(res).toBe(blob);
@@ -77,7 +79,6 @@ test('_apiCallBlob response with 503 code', async () => {
 });
 
 test('_apiCallBlob response with 503 code more than 10 times', async () => {
-    quipService.stats.query_count = 0;
     fetch.mockReturnValue(Promise.resolve(response503));
     const res = await quipService._apiCallBlob('/someURL');
     expect(res).toBe(undefined);
diff --git a/lib/__tests__/__snapshots__/QuipProcessor.test.js.snap b/lib/__tests__/__snapshots__/QuipProcessor.test.js.snap
index 3b0bc2b..4c48f20 100644
--- a/lib/__tests__/__snapshots__/QuipProcessor.test.js.snap
+++ b/lib/__tests__/__snapshots__/QuipProcessor.test.js.snap
@@ -6,5 +6,5 @@ exports[`methods tests _getThreadMessagesHtml thread with messages 1`] = `
 <div class=\\"message\\"><span class=\\"message--user\\">Heller Stern, 8 May 2020, 09:19<br/></span>Message with thread link  <a href=\\"RELATIVE_PATH\\">Document-1</a>PROCESSED-THREAD</div>
 <div class=\\"message\\"><span class=\\"message--user\\">Heller Stern, 8 May 2020, 09:20<br/></span>Message with person-link  <span class=\\"message--user\\">@Alex</span></div>
 <div class=\\"message\\"><span class=\\"message--user\\">Heller Stern, 8 May 2020, 09:20<br/></span><br/><img class='message--image' src='RELATIVE_PATH'></img><br/>PROCESSED-IMAGE<br/></div>
-<div class=\\"message\\"><span class=\\"message--user\\">Heller Stern, 25 May 2020, 20:21<br/></span>444444<br/><a href=\\"RELATIVE_PATH\\">document1.html</a><br/>PROCESSED-FILE<br/><br/><a href=\\"RELATIVE_PATH\\">document1.pdf</a><br/>PROCESSED-FILE<br/></div></div>"
+<div class=\\"message\\"><span class=\\"message--user\\">Heller Stern, 25 May 2020, 20:21<br/></span>444444<br/><a href=\\"RELATIVE_PATH\\">document1.html</a><br/>PROCESSED-FILE<br/><br/><a href=\\"RELATIVE_PATH\\">document1.pdf</a><br/>PROCESSED-FILE<br/><br/><a href=\\"RELATIVE_PATH\\">document_unknown_type</a><br/>PROCESSED-FILE<br/><br/><a href=\\"RELATIVE_PATH\\">sVhMwHaxsgiwmfMi4au1Zg111</a><br/>PROCESSED-FILE<br/></div></div>"
 `;
diff --git a/lib/__tests__/messages.json b/lib/__tests__/messages.json
index e9f77bd..fcb4f87 100644
--- a/lib/__tests__/messages.json
+++ b/lib/__tests__/messages.json
@@ -48,6 +48,13 @@
       {
         "name": "document1.pdf",
         "hash": "sVhMwHaxsgiwmfMi4au1Zg"
+      },
+      {
+        "name": "document_unknown_type",
+        "hash": "1c2EXOl1sx04g5_hPNmt1A222"
+      },
+      {
+        "hash": "sVhMwHaxsgiwmfMi4au1Zg111"
       }
     ],
     "author_name": "Heller Stern"
diff --git a/package.json b/package.json
index 0e9a89a..24d7941 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "quip-export",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "Export all folders and documents from Quip",
   "main": "index.js",
   "jest": {