diff --git a/docs/source/whatsnew/v0.9.1.txt b/docs/source/whatsnew/v0.9.1.txt
index 3ec1cb44..f78eaad3 100644
--- a/docs/source/whatsnew/v0.9.1.txt
+++ b/docs/source/whatsnew/v0.9.1.txt
@@ -20,13 +20,15 @@ Enhancements
   from every trading board (ver. 0.9.0 behaviour)
 - Docs for MOEX reedited
 
-.. _whatsnew_080.bug_fixes:
+.. _whatsnew_091.bug_fixes:
 
 Bug Fixes
 ~~~~~~~~~
 
 - Fixed broken links on the github ussies on "What’s New" docs pages
+- Deduplicate rows with the same index (:issue:`610`) (:issue:`738`)
 
 Contributors
 ~~~~~~~~~~~~
-- Dmitry Alekseev
\ No newline at end of file
+- Dmitry Alekseev
+- Chang Lan
\ No newline at end of file
diff --git a/pandas_datareader/base.py b/pandas_datareader/base.py
index 4d4148df..cbec8e85 100644
--- a/pandas_datareader/base.py
+++ b/pandas_datareader/base.py
@@ -139,7 +139,7 @@ def _sanitize_response(response):
         return response.content
 
     def _get_response(self, url, params=None, headers=None):
-        """ send raw HTTP request to get requests.Response from the specified url
+        """send raw HTTP request to get requests.Response from the specified url
         Parameters
         ----------
         url : str
@@ -265,7 +265,10 @@ def _dl_mult_symbols(self, symbols):
         for sym_group in _in_chunks(symbols, self.chunksize):
             for sym in sym_group:
                 try:
-                    stocks[sym] = self._read_one_data(self.url, self._get_params(sym))
+                    df = self._read_one_data(self.url, self._get_params(sym))
+                    # Keep the last item if there are duplicated rows with the same index.
+                    df = df[~df.index.duplicated(keep="last")]
+                    stocks[sym] = df
                     passed.append(sym)
                 except (IOError, KeyError):
                     msg = "Failed to read symbol: {0!r}, replacing with NaN."