diff --git a/zesje/pregrader.py b/zesje/pregrader.py
index 12258cfddee5913f76397dfd5d844fa8cb9d7917..b1511ab7ec7e978eaed3c878e2014a4f15b15ab6 100644
--- a/zesje/pregrader.py
+++ b/zesje/pregrader.py
@@ -13,7 +13,7 @@
 import cv2
 import numpy as np
 
-from zesje.database import db, Solution, ProblemWidget, Problem
+from zesje.database import db, Solution, ProblemWidget
 from zesje.images import guess_dpi, get_box, fix_corner_markers
 
 
diff --git a/zesje/scans.py b/zesje/scans.py
index 6ba14b9a1ec5b646a608ad4e332625b34c5014de..8e7efceff0edaa6cd57e1f31eaf9cf615d3546ff 100644
--- a/zesje/scans.py
+++ b/zesje/scans.py
@@ -54,7 +54,7 @@ def process_pdf(scan_id):
         # TODO: When #182 is implemented, properly separate user-facing
         #       messages (written to DB) from developer-facing messages,
         #       which should be written into the log.
-        write_pdf_status(scan_id, 'error', "Unexpected error: " + traceback.format_exc())
+        write_pdf_status(scan_id, 'error', f"Unexpected error: {error}\n Traceback:\n" + traceback.format_exc())
 
 
 def _process_pdf(scan_id, app_config):