--- a/py/gaphrase_srs_anki.py	Sat Apr 20 21:06:13 2019 +0300
+++ b/py/gaphrase_srs_anki.py	Sat Apr 20 21:06:43 2019 +0300
@@ -135,6 +135,8 @@
                 phrase_buf.append(self.line)
         if len(phrases) == 0:
             raise ParseException("""There are no any phrases...""")
+        if num in self.dom:
+            raise ParseException("""Conflicting key: {}...""".format(num))
         self.dom[num] = phrases
 
 FIN = io.open(FINAME, mode='r', buffering=1, encoding="utf-8")