diff --git a/api/obs/api/app.py b/api/obs/api/app.py
index 6ad6b0a..100cafa 100644
--- a/api/obs/api/app.py
+++ b/api/obs/api/app.py
@@ -13,7 +13,7 @@ from sanic.response import (
     file as file_response,
     html as html_response,
 )
-from sanic.exceptions import Unauthorized
+from sanic.exceptions import Unauthorized, SanicException
 from sanic_session import Session, InMemorySessionInterface
 
 from sqlalchemy import select
@@ -31,6 +31,20 @@ c = app.config
 api = Blueprint("api", url_prefix="/api")
 auth = Blueprint("auth", url_prefix="")
 
+
+@api.exception(SanicException, BaseException)
+def _handle_sanic_errors(_request, exception):
+    log.error("Exception in handler: %s", exception, exc_info=True)
+    return json_response(
+        {
+            "errors": {
+                type(exception).__name__: str(exception),
+            },
+        },
+        status=exception.status_code if hasattr(exception, "status_code") else 500,
+    )
+
+
 # Configure paths
 def configure_paths(c):
     c.API_ROOT_DIR = c.get("API_ROOT_DIR") or abspath(
diff --git a/api/obs/api/db.py b/api/obs/api/db.py
index 09eb3af..22e4746 100644
--- a/api/obs/api/db.py
+++ b/api/obs/api/db.py
@@ -145,6 +145,8 @@ class Road(Base):
 
 NOW = text("NOW()")
 
+class DuplicateTrackFileError(ValueError):
+    pass
 
 class Track(Base):
     __tablename__ = "track"
@@ -262,7 +264,7 @@ class Track(Base):
         )
 
         if duplicate_count:
-            raise ValueError("duplicate file")
+            raise DuplicateTrackFileError()
 
         self.original_file_hash = hex_hash
 
diff --git a/api/obs/api/routes/tracks.py b/api/obs/api/routes/tracks.py
index 1954fa8..8697724 100644
--- a/api/obs/api/routes/tracks.py
+++ b/api/obs/api/routes/tracks.py
@@ -6,7 +6,7 @@ from os.path import join, exists, isfile
 from sqlalchemy import select, func
 from sqlalchemy.orm import joinedload
 
-from obs.api.db import Track, User, Comment
+from obs.api.db import Track, User, Comment, DuplicateTrackFileError
 from obs.api.app import api, require_auth, read_api_key, json
 
 from sanic.response import file_stream, empty
@@ -112,7 +112,11 @@ async def post_track(req):
         else req.ctx.user.are_tracks_visible_for_all,
     )
     track.generate_slug()
-    await track.prevent_duplicates(req.ctx.db, file.body)
+    try:
+        await track.prevent_duplicates(req.ctx.db, file.body)
+    except DuplicateTrackFileError:
+        raise InvalidUsage("Track file is not unique")
+
     track.uploaded_by_user_agent = normalize_user_agent(req.headers["user-agent"])
     track.original_file_name = file.name
     await track.write_to_original_file(req.app.config, file.body)
diff --git a/frontend/src/pages/UploadPage.tsx b/frontend/src/pages/UploadPage.tsx
index ca74d6f..10783a5 100644
--- a/frontend/src/pages/UploadPage.tsx
+++ b/frontend/src/pages/UploadPage.tsx
@@ -49,7 +49,7 @@ export function FileUploadStatus({
 }: {
   id: string
   file: File
-  onComplete: (result: FileUploadResult) => void
+  onComplete: (id: string, result: FileUploadResult) => void
   slug?: string
 }) {
   const [progress, setProgress] = React.useState(0)