diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fc0588..9c9f3c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## 2.9.0 [unreleased]
 
+### Bug Fixes
+1. [#123](https://github.com/influxdata/influxdb-client-ruby/pull/123): Duplicate columns warning shows in improper situations
+
 ## 2.8.0 [2022-10-27]
 
 ### Features
diff --git a/lib/influxdb2/client/client.rb b/lib/influxdb2/client/client.rb
index b19925b..177cee6 100644
--- a/lib/influxdb2/client/client.rb
+++ b/lib/influxdb2/client/client.rb
@@ -51,7 +51,6 @@ class Client
     # @option options [Logger] :logger Logger used for logging. Disable logging by set to false.
     # @option options [bool] :debugging Enable debugging for HTTP request/response.
     # @option options [Hash] :tags Default tags which will be added to each point written by api.
-    #   the body line-protocol
     def initialize(url, token, options = nil)
       @auto_closeable = []
       @options = options ? options.dup : {}
diff --git a/lib/influxdb2/client/flux_csv_parser.rb b/lib/influxdb2/client/flux_csv_parser.rb
index 317b691..eca8e78 100644
--- a/lib/influxdb2/client/flux_csv_parser.rb
+++ b/lib/influxdb2/client/flux_csv_parser.rb
@@ -188,7 +188,7 @@ def _add_column_names_and_tags(table, csv)
         i += 1
       end
 
-      duplicates = table.columns.group_by { :label }.select { |_k, v| v.size > 1 }
+      duplicates = table.columns.group_by(&:label).select { |_k, v| v.size > 1 }
 
       warning = "The response contains columns with duplicated names: #{duplicates.keys.join(', ')}
 You should use the 'FluxRecord.row to access your data instead of 'FluxRecord.values' hash."
diff --git a/test/influxdb/flux_csv_parser_test.rb b/test/influxdb/flux_csv_parser_test.rb
index ce69264..413a308 100644
--- a/test/influxdb/flux_csv_parser_test.rb
+++ b/test/influxdb/flux_csv_parser_test.rb
@@ -516,14 +516,44 @@ def test_parse_duplicate_column_names
 ,,0,2022-09-13T06:14:40.469404272Z,2022-09-13T06:24:40.469404272Z,2022-09-13T06:24:39.299Z,my_measurement,Prague,25.3
 ,,0,2022-09-13T06:14:40.469404272Z,2022-09-13T06:24:40.469404272Z,2022-09-13T06:24:40.454Z,my_measurement,Prague,25.3'
 
-    tables = InfluxDB2::FluxCsvParser.new(data, stream: false, response_mode: InfluxDB2::FluxResponseMode::ONLY_NAMES)
-                                     .parse
-                                     .tables
-    assert_equal 1, tables.size
-    assert_equal 8, tables[0].columns.size
-    assert_equal 3, tables[0].records.size
-    assert_equal 7, tables[0].records[0].values.size
-    assert_equal 8, tables[0].records[0].row.size
-    assert_equal 25.3, tables[0].records[0].row[7]
+    out, = capture_io do
+      tables = InfluxDB2::FluxCsvParser.new(data, stream: false, response_mode: InfluxDB2::FluxResponseMode::ONLY_NAMES)
+                                       .parse
+                                       .tables
+
+      assert_equal 1, tables.size
+      assert_equal 8, tables[0].columns.size
+      assert_equal 3, tables[0].records.size
+      assert_equal 7, tables[0].records[0].values.size
+      assert_equal 8, tables[0].records[0].row.size
+      assert_equal 25.3, tables[0].records[0].row[7]
+    end
+
+    assert_match 'The response contains columns with duplicated names: result', out
+  end
+
+  def test_parse_without_duplicates
+    data = '#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3339,string,string,double
+#group,false,false,true,true,false,true,true,false
+#default,_result,,,,,,,
+ ,result,table,_start,_stop,_time,_measurement,location,result2
+,,0,2022-09-13T06:14:40.469404272Z,2022-09-13T06:24:40.469404272Z,2022-09-13T06:24:33.746Z,my_measurement,Prague,25.3
+,,0,2022-09-13T06:14:40.469404272Z,2022-09-13T06:24:40.469404272Z,2022-09-13T06:24:39.299Z,my_measurement,Prague,25.3
+,,0,2022-09-13T06:14:40.469404272Z,2022-09-13T06:24:40.469404272Z,2022-09-13T06:24:40.454Z,my_measurement,Prague,25.3'
+
+    out, = capture_io do
+      tables = InfluxDB2::FluxCsvParser.new(data, stream: false, response_mode: InfluxDB2::FluxResponseMode::ONLY_NAMES)
+                                       .parse
+                                       .tables
+
+      assert_equal 1, tables.size
+      assert_equal 8, tables[0].columns.size
+      assert_equal 3, tables[0].records.size
+      assert_equal 8, tables[0].records[0].values.size
+      assert_equal 8, tables[0].records[0].row.size
+      assert_equal 25.3, tables[0].records[0].row[7]
+    end
+
+    assert_equal '', out
   end
 end