diff --git a/libcryptomarket/__init__.py b/libcryptomarket/__init__.py
index 6d5350e..0a742f7 100644
--- a/libcryptomarket/__init__.py
+++ b/libcryptomarket/__init__.py
@@ -4,4 +4,4 @@
 
 __author__ = """Gavin Chan"""
 __email__ = 'gavincyi@gmail.com'
-__version__ = '0.1.0'
+__version__ = '0.1.1'
diff --git a/libcryptomarket/api/poloniex_api.py b/libcryptomarket/api/poloniex_api.py
index 0a59ab6..899c9da 100644
--- a/libcryptomarket/api/poloniex_api.py
+++ b/libcryptomarket/api/poloniex_api.py
@@ -1,11 +1,9 @@
 #!/bin/python
 import requests
-from datetime import datetime
-import logging
-
 API_URL = "https://poloniex.com/public?command="
 VALID_PERIODS = [300, 900, 1800, 7200, 14400, 86400]
 
+
 def get_return_chart_data(currency_pair, period, start, end=None):
     """Return returnChartData.
 
@@ -29,4 +27,8 @@ def get_return_chart_data(currency_pair, period, start, end=None):
 
     r = requests.get(url)
     r.raise_for_status()
-    return r.json()
\ No newline at end of file
+    rjson = r.json()
+    if isinstance(rjson, dict) and 'error' in rjson.keys():
+        raise ValueError("Query error from Poloniex API ({0})".format(rjson))
+
+    return r.json()
diff --git a/libcryptomarket/historical.py b/libcryptomarket/historical.py
index 79c7bcf..0d50d50 100644
--- a/libcryptomarket/historical.py
+++ b/libcryptomarket/historical.py
@@ -145,13 +145,10 @@ def _get_historical_prices_cryptocompare(symbol, exchange, period,
 def _get_historical_prices_poloniex(symbol, period, from_time, to_time):
     from libcryptomarket.api.poloniex_api import get_return_chart_data
     data = get_return_chart_data(symbol, period, from_time, to_time)
-    if len(data) == 0 or isinstance(data, dict):
-        raise ValueError("Poloniex data is not in a right format.\n{0}".format(
-            data))
-
     data = pd.DataFrame(data)
-    data['date'] = data['date'].map(lambda x: pd.Timestamp(datetime.fromtimestamp(x)))
+    data['date'] = data['date'].map(
+        lambda x: pd.Timestamp(datetime.fromtimestamp(x)))
     data.columns = "r_" + data.columns.str.lower()
     data = data.set_index(['r_date'])
     data.index.name = 'datetime'
-    return data
\ No newline at end of file
+    return data
diff --git a/setup.py b/setup.py
index b5c1c5b..a136e67 100644
--- a/setup.py
+++ b/setup.py
@@ -4,6 +4,7 @@
 """The setup script."""
 
 from setuptools import setup, find_packages
+from libcryptomarket import __version__
 
 with open('README.md') as readme_file:
     readme = readme_file.read()
@@ -28,7 +29,7 @@ test_requirements = [
 
 setup(
     name='libcryptomarket',
-    version='0.1.0',
+    version=__version__,
     description="Library for cryptocurrency market information.",
     long_description=readme + '\n\n' + history,
     author="Gavin Chan",
diff --git a/tests/test_cryptocompare_api.py b/tests/test_cryptocompare_api.py
index 87fdda4..00018c4 100644
--- a/tests/test_cryptocompare_api.py
+++ b/tests/test_cryptocompare_api.py
@@ -145,7 +145,7 @@ def test_get_historical_prices_cryptocompare(monkeypatch):
     result = get_historical_prices(source='cryptocompare',
                                    period='minute',
                                    exchange='Poloniex',
-                                   symbol='LTCBTC')
+                                   symbol='LTC/BTC')
 
     expected_result = pd.DataFrame([
         {