title: ValueError: cannot index with vector containing NA / NaN values
body: <p>I do not understand why I am receiving the error listed in the title, the value that I am intending to return is the number 30</p>
  
  <pre><code>import csv
  import os
  import pandas as pd
  os.chdir('C:\\Users\\khalha\\Desktop\\RealExcel')
  filename = 'sales.csv'
  
  Sales = pd.read_csv('sales.csv')
  iFlowStatus = Sales[Sales['Product'].str.contains('iFlow')]['Status']
  print(iFlowStatus)
  </code></pre>