Insert data from dataframe to clickhouse table ERROR

I'm trying to insert data from dataframe to my clickhouse table. Types are matching, I don't have any FLOAT fields, still get an error: 'TypeError: object of type 'float' has no len()'

Table table_main:

client.command('''CREATE TABLE db1.table_main (                 scroll_id String,                took Int64,                timed_out Boolean,                shards_total Int64,                shards_successful Int64,                shards_skipped Int64,                shards_failed Int64,                hits_total_value Int64,                hits_total_relation String,                hits_max_score String,                key Int64,                terminated_early String)                 ENGINE MergeTree                ORDER BY key''')

Dataframe table_main:

scroll_id              objecttook                    int64timed_out                boolshards_total            int64shards_successful       int64shards_skipped          int64shards_failed           int64hits_total_value        int64hits_total_relation    objecthits_max_score         objectkey                     int64terminated_early       objectdtype: object

Command:

client.insert_df('db1.table_main', table_main)

Could you please give any guess what's wrong?Thanks a lot.