diff --git a/openlp/core/ui/slidecontroller.py b/openlp/core/ui/slidecontroller.py
index 30341b9dd..5ea2c5f23 100644
--- a/openlp/core/ui/slidecontroller.py
+++ b/openlp/core/ui/slidecontroller.py
@@ -625,14 +625,14 @@ class SlideController(QtGui.QWidget):
                 label.setMargin(4)
                 label.setScaledContents(True)
                 if self.serviceItem.is_command():
-                    image = QtGui.QImage(frame[u'image'])
+                    label.setPixmap(QtGui.QPixmap(frame[u'image']))
                 else:
                     # If current slide set background to image
                     if framenumber == slideno:
                         self.serviceItem.bg_image_bytes = \
                             self.imageManager.get_image_bytes(frame[u'title'])
                     image = self.imageManager.get_image(frame[u'title'])
-                label.setPixmap(QtGui.QPixmap.fromImage(image))
+                    label.setPixmap(QtGui.QPixmap.fromImage(image))
                 self.previewListWidget.setCellWidget(framenumber, 0, label)
                 slideHeight = width * self.parent().renderer.screen_ratio
                 row += 1
diff --git a/openlp/plugins/presentations/lib/mediaitem.py b/openlp/plugins/presentations/lib/mediaitem.py
index 5e14a88eb..e0bc1be0d 100644
--- a/openlp/plugins/presentations/lib/mediaitem.py
+++ b/openlp/plugins/presentations/lib/mediaitem.py
@@ -191,7 +191,7 @@ class PresentationMediaItem(MediaManagerItem):
                     doc.load_presentation()
                     preview = doc.get_thumbnail_path(1, True)
                 doc.close_presentation()
-                if not os.path.exists(preview):
+                if not (preview and os.path.exists(preview)):
                     icon = build_icon(u':/general/general_delete.png')
                 else:
                     if validate_thumb(preview, thumb):
diff --git a/openlp/plugins/presentations/lib/presentationcontroller.py b/openlp/plugins/presentations/lib/presentationcontroller.py
index f0588e1bc..c26396229 100644
--- a/openlp/plugins/presentations/lib/presentationcontroller.py
+++ b/openlp/plugins/presentations/lib/presentationcontroller.py
@@ -149,7 +149,7 @@ class PresentationDocument(object):
         the powerpoint file.
         """
         lastimage = self.get_thumbnail_path(self.get_slide_count(), True)
-        if not os.path.isfile(lastimage):
+        if not (lastimage and os.path.isfile(lastimage)):
             return False
         return validate_thumb(self.filepath, lastimage)