stacktrace pandas conditional merge

IndexError                                Traceback (most recent call last)
<ipython-input-68-525af8799900> in <module>
      5         return e_push_count.loc[e_push_count['mini_e'] < row['push_count']].iloc[-1]['percent_e']
      6 
----> 7 df2['push_count_score'] = df.apply(add_push_count, axis=1)
      8 
      9 

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\frame.py in apply(self, func, axis, broadcast, raw, reduce, result_type, args, **kwds)
   6485                          args=args,
   6486                          kwds=kwds)
-> 6487         return op.get_result()
   6488 
   6489     def applymap(self, func):

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\apply.py in get_result(self)
    149             return self.apply_raw()
    150 
--> 151         return self.apply_standard()
    152 
    153     def apply_empty_result(self):

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\apply.py in apply_standard(self)
    255 
    256         # compute the result using the series generator
--> 257         self.apply_series_generator()
    258 
    259         # wrap results

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\apply.py in apply_series_generator(self)
    284             try:
    285                 for i, v in enumerate(series_gen):
--> 286                     results[i] = self.f(v)
    287                     keys.append(v.name)
    288             except Exception as e:

<ipython-input-68-525af8799900> in add_push_count(row)
      3         return n_push_count.loc[n_push_count['mini_n'] < row['push_count']].iloc[-1]['percent_n']
      4     elif row['deal_type'] == 'Expansion':
----> 5         return e_push_count.loc[e_push_count['mini_e'] < row['push_count']].iloc[-1]['percent_e']
      6 
      7 df2['push_count_score'] = df.apply(add_push_count, axis=1)

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\indexing.py in __getitem__(self, key)
   1498 
   1499             maybe_callable = com.apply_if_callable(key, self.obj)
-> 1500             return self._getitem_axis(maybe_callable, axis=axis)
   1501 
   1502     def _is_scalar_access(self, key):

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\indexing.py in _getitem_axis(self, key, axis)
   2228 
   2229             # validate the location
-> 2230             self._validate_integer(key, axis)
   2231 
   2232             return self._get_loc(key, axis=axis)

c:\Users\Thomas Callaghan\PycharmProjects\SFDCAPI\venv\lib\site-packages\pandas\core\indexing.py in _validate_integer(self, key, axis)
   2137         len_axis = len(self.obj._get_axis(axis))
   2138         if key >= len_axis or key < -len_axis:
-> 2139             raise IndexError("single positional indexer is out-of-bounds")
   2140 
   2141     def _getitem_tuple(self, tup):

IndexError: ('single positional indexer is out-of-bounds', 'occurred at index 0')