Heatmap 오류

안녕하세요? HeatMap 실행에서 다음과 같은 오류가 납니다. 해결을 위한 조언을 부탁합니다. 감사합니다. 

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TypeError                                 Traceback (most recent call last)
<ipython-input-91-0878fd8b3426> in <module>
     23 
     24 
---> 25 HeatMap(heat).add_to(m)
     26 
     27 m.save('Heatmap.html')

C:\Anaconda\lib\site-packages\folium\plugins\heat_map.py in __init__(self, data, name, min_opacity, max_zoom, max_val, radius, blur, gradient, overlay, control, show, **kwargs)
     66         self.data = [[*validate_location(line[:2]), *line[2:]]  # noqa: E999
     67                      for line in data]
---> 68         if np.any(np.isnan(self.data)):
     69             raise ValueError('data may not contain NaNs.')
     70         self.options = parse_options(

TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''