diff --git a/src/calibre/ebooks/mobi/writer.py b/src/calibre/ebooks/mobi/writer.py
index 5bd75d5e9a..04fd835c96 100644
--- a/src/calibre/ebooks/mobi/writer.py
+++ b/src/calibre/ebooks/mobi/writer.py
@@ -1963,6 +1963,11 @@ class MobiWriter(object):
                         self._oeb.logger.warn('  Ignoring TOC entry with no href:',
                                 child.title)
                         continue
+                    if h not in self._id_offsets:
+                        self._oeb.logger.warn('  Ignoring missing TOC entry:',
+                                child)
+                        continue
+
                     currentOffset = self._id_offsets[h]
                     # print "_generate_ctoc: child offset: 0x%X" % currentOffset
 
diff --git a/src/calibre/ebooks/oeb/iterator.py b/src/calibre/ebooks/oeb/iterator.py
index 2b68b6cf57..03c09262d4 100644
--- a/src/calibre/ebooks/oeb/iterator.py
+++ b/src/calibre/ebooks/oeb/iterator.py
@@ -41,9 +41,12 @@ class SpineItem(unicode):
 
     def __new__(cls, *args):
         args = list(args)
-        args[0] = args[0].partition('#')[0]
-        obj = super(SpineItem, cls).__new__(cls, *args)
         path = args[0]
+        ppath = path.partition('#')[0]
+        if not os.path.exists(path) and os.path.exists(ppath):
+            path = ppath
+        args[0] = path
+        obj = super(SpineItem, cls).__new__(cls, *args)
         raw = open(path, 'rb').read()
         raw, obj.encoding = xml_to_unicode(raw)
         obj.character_count = character_count(raw)