diff --git a/public/scripts/network.js b/public/scripts/network.js
index c92befc..4382597 100644
--- a/public/scripts/network.js
+++ b/public/scripts/network.js
@@ -1082,7 +1082,7 @@ class PeersManager {
     }
 
     async _onFilesSelected(message) {
-        let files = mime.addMissingMimeTypesToFiles(message.files);
+        let files = mime.addMissingMimeTypesToFiles([...message.files]);
         await this.peers[message.to].requestFileTransfer(files);
     }
 
@@ -1306,9 +1306,8 @@ class FileDigester {
         const blob = new Blob(this._buffer)
         this._buffer = null;
         this._callback(new File([blob], this._name, {
-            type: this._mime,
+            type: this._mime || "application/octet-stream",
             lastModified: new Date().getTime()
         }));
     }
-
 }
diff --git a/public/scripts/util.js b/public/scripts/util.js
index 1dcc388..24e2626 100644
--- a/public/scripts/util.js
+++ b/public/scripts/util.js
@@ -392,7 +392,8 @@ const mime = (() => {
         "vob": "video/x-ms-vob",
         "wmv": "video/x-ms-wmv",
         "avi": "video/x-msvideo",
-        "*": "video/x-sgi-movie"
+        "*": "video/x-sgi-movie",
+        "kdbx": "application/x-keepass2"
     }
 
     return {
@@ -409,7 +410,7 @@ const mime = (() => {
             // if filetype is empty guess via suffix otherwise leave unchanged
             for (let i = 0; i < files.length; i++) {
                 if (!files[i].type) {
-                    files[i] = new File([files[i]], files[i].name, {type: mime.guessMimeByFilename(files[i].name) || ""});
+                    files[i] = new File([files[i]], files[i].name, {type: mime.guessMimeByFilename(files[i].name) || "application/octet-stream"});
                 }
             }
             return files;