diff --git a/src/calibre/devices/prs505/driver.py b/src/calibre/devices/prs505/driver.py
index 094c12cf0c..f90a8ab263 100644
--- a/src/calibre/devices/prs505/driver.py
+++ b/src/calibre/devices/prs505/driver.py
@@ -35,7 +35,7 @@ class PRS505(USBMS):
 
     VENDOR_NAME        = 'SONY'
     WINDOWS_MAIN_MEM   = re.compile(
-            r'(PRS-(505|500))|'
+            r'(PRS-(505|500|300))|'
             r'(PRS-((700[#/])|((6|9|3)(0|5)0&)))'
             )
     WINDOWS_CARD_A_MEM = re.compile(
diff --git a/src/calibre/ebooks/oeb/transforms/rescale.py b/src/calibre/ebooks/oeb/transforms/rescale.py
index 55aafded5c..c3b4d6d40c 100644
--- a/src/calibre/ebooks/oeb/transforms/rescale.py
+++ b/src/calibre/ebooks/oeb/transforms/rescale.py
@@ -72,10 +72,13 @@ class RescaleImages(object):
                                 Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
                         data = pixmap_to_data(img, format=ext)
                     else:
-                        im = im.resize((int(new_width), int(new_height)), PILImage.ANTIALIAS)
-                        of = cStringIO.StringIO()
-                        im.convert('RGB').save(of, ext)
-                        data = of.getvalue()
+                        try:
+                            im = im.resize((int(new_width), int(new_height)), PILImage.ANTIALIAS)
+                            of = cStringIO.StringIO()
+                            im.convert('RGB').save(of, ext)
+                            data = of.getvalue()
+                        except:
+                            self.log.exception('Failed to rescale image')
                     if data is not None:
                         item.data = data
                         item.unload_data_from_memory()