diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index e032c73eeb..9b73f68973 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -225,11 +225,17 @@ class PartList(generics.ListCreateAPIView):
 
                 # Use the 'thumbnail' image here instead of the full-size image
                 # Note: The full-size image is used when requesting the /api/part/<x>/ endpoint
-                fn, ext = os.path.splitext(img)
 
-                thumb = "{fn}.thumbnail{ext}".format(fn=fn, ext=ext)
+                if img:
+                    fn, ext = os.path.splitext(img)
 
-                item['thumbnail'] = os.path.join(settings.MEDIA_URL, thumb)
+                    thumb = "{fn}.thumbnail{ext}".format(fn=fn, ext=ext)
+
+                    thumb = os.path.join(settings.MEDIA_URL, thumb)
+                else:
+                    thumb = ''
+
+                item['thumbnail'] = thumb
 
                 del item['image']
 
diff --git a/InvenTree/stock/api.py b/InvenTree/stock/api.py
index 3c3e5acce6..53d4b15d13 100644
--- a/InvenTree/stock/api.py
+++ b/InvenTree/stock/api.py
@@ -340,12 +340,17 @@ class StockList(generics.ListCreateAPIView):
 
             img = item['part__image']
 
-            # Use the thumbnail image instead
-            fn, ext = os.path.splitext(img)
+            if img:
+                # Use the thumbnail image instead
+                fn, ext = os.path.splitext(img)
 
-            thumb = "{fn}.thumbnail{ext}".format(fn=fn, ext=ext)
+                thumb = "{fn}.thumbnail{ext}".format(fn=fn, ext=ext)
 
-            item['part__thumbnail'] = os.path.join(settings.MEDIA_URL, thumb)
+                thumb = os.path.join(settings.MEDIA_URL, thumb)
+            else:
+                thumb = ''
+
+            item['part__thumbnail'] = thumb
 
             del item['part__image']