diff --git a/src/imxml2django.py b/src/imxml2django.py
index 30feefd..b04eb20 100755
--- a/src/imxml2django.py
+++ b/src/imxml2django.py
@@ -878,6 +878,9 @@ def make_index(index_hits, index_type):
     for xmlEOAindex in index_hits:
         strMainEntry = xmlEOAindex.get("main")
         str_display_entry = xmlEOAindex.get("display")
+        if len(strMainEntry) == 0:
+            strMainEntry = str_display_entry
+            logging.warning("Index found without main entry, only display string. Using display string for sorting.")
 
         # If strMainEntry not in Index, then create new index element
         if strMainEntry not in dictIndex: