diff --git a/src/calibre/ebooks/docx/cleanup.py b/src/calibre/ebooks/docx/cleanup.py
index bb421afc89..cea90f137f 100644
--- a/src/calibre/ebooks/docx/cleanup.py
+++ b/src/calibre/ebooks/docx/cleanup.py
@@ -173,7 +173,10 @@ def cleanup_markup(log, root, styles, dest_dir, detect_cover):
                     width, height, fmt = identify(path)
                 except:
                     width, height, fmt = 0, 0, None
-                is_cover = 0.8 <= height/width <= 1.8 and height*width >= 160000
+                try:
+                    is_cover = 0.8 <= height/width <= 1.8 and height*width >= 160000
+                except ZeroDivisionError:
+                    is_cover = False
                 if is_cover:
                     log.debug('Detected an image that looks like a cover')
                     img.getparent().remove(img)