Change the arg of np.argwhere

Author: makbigc

pandas/io/stata.py

@@ -1629,7 +1629,8 @@ def _do_convert_missing(self, data, convert_missing):
                 continue
 
             if convert_missing:  # Replacement follows Stata notation
-                missing_loc = np.argwhere(missing)
+
+                missing_loc = np.argwhere(missing.values)
                 umissing, umissing_loc = np.unique(series[missing],
                                                    return_inverse=True)
                 replacement = Series(series, dtype=np.object)