diff --git a/common/create_lib_library.py b/common/create_lib_library.py
index 6538d72..0170969 100755
--- a/common/create_lib_library.py
+++ b/common/create_lib_library.py
@@ -92,7 +92,8 @@
                     for lline in llines:
                         if headerdone:
                             if not headerseen:
-                                if not lline.split()[0] == 'cell':
+                                ltok = lline.split()
+                                if len(ltok) == 0 or not ltok[0] == 'cell':
                                     continue
                                 else:
                                     headerseen = True