diff --git a/influxdb/_dataframe_client.py b/influxdb/_dataframe_client.py
index 646f298c..3473f1cd 100644
--- a/influxdb/_dataframe_client.py
+++ b/influxdb/_dataframe_client.py
@@ -10,6 +10,7 @@
from collections import defaultdict
import pandas as pd
+import pandas.core.common as pdcom
import numpy as np
from .client import InfluxDBClient
@@ -343,6 +344,17 @@ def _convert_dataframe_to_lines(self,
tag_columns.append(tag)
tag_df = dataframe[tag_columns]
+ for tag_col_i in tag_columns:
+ if pdcom.is_categorical_dtype(tag_df[tag_col_i]):
+ if '' not in tag_df[tag_col_i].cat.categories:
+ tag_df[tag_col_i] = (tag_df[tag_col_i].cat.
+ add_categories('').
+ fillna('').
+ astype(str))
+ else:
+ tag_df[tag_col_i] = (tag_df[tag_col_i].
+ fillna('').
+ astype(str))
tag_df = tag_df.fillna('') # replace NA with empty string
tag_df = tag_df.sort_index(axis=1)
tag_df = self._stringify_dataframe(
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