diff --git a/pkg/services/live/telemetry/telegraf/convert.go b/pkg/services/live/telemetry/telegraf/convert.go
index 399f62d8378..b445a444303 100644
--- a/pkg/services/live/telemetry/telegraf/convert.go
+++ b/pkg/services/live/telemetry/telegraf/convert.go
@@ -331,6 +331,15 @@ func (s *metricFrame) getFieldTypeAndValue(f *influx.Field) (data.FieldType, int
 	if err != nil {
 		return ft, nil, fmt.Errorf("value convert error: %v", err)
 	}
+	if ft == data.FieldTypeNullableString {
+		// We observed commercial Telegraf extensions that send NaN values as strings.
+		// Native Telegraf influx serializer drops fields with NaN values. While this
+		// fixes an observed scenario we still need to think on a more generic approach
+		// how to handle occasionally missing fields (maybe on a UI, maybe on a backend side).
+		if stringVal, ok := v.(*string); ok && stringVal != nil && *stringVal == "NaN" {
+			return data.FieldTypeNullableFloat64, nil, nil
+		}
+	}
 	return ft, v, nil
 }
 
diff --git a/pkg/services/live/telemetry/telegraf/testdata/changing_types_NaN.golden.txt b/pkg/services/live/telemetry/telegraf/testdata/changing_types_NaN.golden.txt
index 902f71bf9bf..d57055c92e7 100644
--- a/pkg/services/live/telemetry/telegraf/testdata/changing_types_NaN.golden.txt
+++ b/pkg/services/live/telemetry/telegraf/testdata/changing_types_NaN.golden.txt
@@ -1,19 +1,19 @@
 🌟 This was machine generated.  Do not edit. 🌟
 
-Frame[0]
+Frame[0] 
 Name: system
 Dimensions: 5 Fields by 4 Rows
-+----------------+-------------------------------+------------------+-----------------+-----------------+
-| Name: labels   | Name: time                    | Name: sensor     | Name: sensor2   | Name: state     |
-| Labels:        | Labels:                       | Labels:          | Labels:         | Labels:         |
-| Type: []string | Type: []time.Time             | Type: []*float64 | Type: []*string | Type: []*string |
-+----------------+-------------------------------+------------------+-----------------+-----------------+
-| host=A         | 2021-03-22 01:51:30 -0700 PDT | 0                | NaN             | aaa             |
-| host=B         | 2021-03-22 01:51:30 -0700 PDT | null             | 0               | bbb             |
-| host=A         | 2021-03-22 01:51:31 -0700 PDT | null             | 0               | ccc             |
-| host=B         | 2021-03-22 01:51:31 -0700 PDT | 0                | NaN             | 1               |
-+----------------+-------------------------------+------------------+-----------------+-----------------+
++----------------+-------------------------------+------------------+------------------+-----------------+
+| Name: labels   | Name: time                    | Name: sensor     | Name: sensor2    | Name: state     |
+| Labels:        | Labels:                       | Labels:          | Labels:          | Labels:         |
+| Type: []string | Type: []time.Time             | Type: []*float64 | Type: []*float64 | Type: []*string |
++----------------+-------------------------------+------------------+------------------+-----------------+
+| host=A         | 2021-03-22 11:51:30 +0300 MSK | 0                | null             | aaa             |
+| host=B         | 2021-03-22 11:51:30 +0300 MSK | null             | 0                | bbb             |
+| host=A         | 2021-03-22 11:51:31 +0300 MSK | null             | 0                | ccc             |
+| host=B         | 2021-03-22 11:51:31 +0300 MSK | 0                | null             | 1               |
++----------------+-------------------------------+------------------+------------------+-----------------+
 
 
 ====== TEST DATA RESPONSE (arrow base64) ======
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