diff --git a/internal/configuration/validation.go b/internal/configuration/validation.go
index 8ee1d65..9aefbf5 100644
--- a/internal/configuration/validation.go
+++ b/internal/configuration/validation.go
@@ -55,7 +55,13 @@ func containsCmdSensors() bool {
 }
 
 func validateSensors(config *Configuration) error {
+	sensorIds := []string{}
+
 	for _, sensorConfig := range config.Sensors {
+		if slices.Contains(sensorIds, sensorConfig.ID) {
+			return errors.New(fmt.Sprintf("Duplicate sensor id detected: %s", sensorConfig.ID))
+		}
+		sensorIds = append(sensorIds, sensorConfig.ID)
 
 		subConfigs := 0
 		if sensorConfig.HwMon != nil {
@@ -107,8 +113,14 @@ func isSensorConfigInUse(config SensorConfig, curves []CurveConfig) bool {
 
 func validateCurves(config *Configuration) error {
 	graph := make(map[interface{}][]interface{})
+	curveIds := []string{}
 
 	for _, curveConfig := range config.Curves {
+		if slices.Contains(curveIds, curveConfig.ID) {
+			return errors.New(fmt.Sprintf("Duplicate curve id detected: %s", curveConfig.ID))
+		}
+		curveIds = append(curveIds, curveConfig.ID)
+
 		subConfigs := 0
 		if curveConfig.Linear != nil {
 			subConfigs++
@@ -219,7 +231,14 @@ func isCurveConfigInUse(config CurveConfig, curves []CurveConfig, fans []FanConf
 }
 
 func validateFans(config *Configuration) error {
+	fanIds := []string{}
+
 	for _, fanConfig := range config.Fans {
+		if slices.Contains(fanIds, fanConfig.ID) {
+			return errors.New(fmt.Sprintf("Duplicate fan id detected: %s", fanConfig.ID))
+		}
+		fanIds = append(fanIds, fanConfig.ID)
+
 		subConfigs := 0
 		if fanConfig.HwMon != nil {
 			subConfigs++
diff --git a/internal/configuration/validation_test.go b/internal/configuration/validation_test.go
index e6b70a8..5c9d9cd 100644
--- a/internal/configuration/validation_test.go
+++ b/internal/configuration/validation_test.go
@@ -1,10 +1,61 @@
 package configuration
 
 import (
+	"fmt"
 	"github.com/stretchr/testify/assert"
 	"testing"
 )
 
+func TestValidateDuplicateFanId(t *testing.T) {
+	// GIVEN
+	fanId := "fan"
+	config := Configuration{
+		Fans: []FanConfig{
+			{
+				ID:    fanId,
+				Curve: "curve",
+				HwMon: nil,
+				File: &FileFanConfig{
+					Path: "abc",
+				},
+			},
+			{
+				ID:    fanId,
+				Curve: "curve",
+				HwMon: nil,
+				File: &FileFanConfig{
+					Path: "abc",
+				},
+			},
+		},
+		Curves: []CurveConfig{
+			{
+				ID: "curve",
+				Linear: &LinearCurveConfig{
+					Sensor: "sensor",
+					Min:    0,
+					Max:    100,
+				},
+				Function: nil,
+			},
+		},
+		Sensors: []SensorConfig{
+			{
+				ID: "sensor",
+				File: &FileSensorConfig{
+					Path: "",
+				},
+			},
+		},
+	}
+
+	// WHEN
+	err := validateConfig(&config, "")
+
+	// THEN
+	assert.EqualError(t, err, fmt.Sprintf("Duplicate fan id detected: %s", fanId))
+}
+
 func TestValidateFanSubConfigIsMissing(t *testing.T) {
 	// GIVEN
 	config := Configuration{
@@ -209,6 +260,46 @@ func TestValidateCurveDependencyWithIdIsNotDefined(t *testing.T) {
 	assert.EqualError(t, err, "Curve curve1: no curve definition with id 'curve2' found")
 }
 
+func TestValidateDuplicateCurveId(t *testing.T) {
+	// GIVEN
+	curveId := "curve"
+	config := Configuration{
+		Curves: []CurveConfig{
+			{
+				ID: curveId,
+				Linear: &LinearCurveConfig{
+					Sensor: "sensor",
+					Min:    0,
+					Max:    100,
+				},
+			},
+			{
+				ID: curveId,
+				Linear: &LinearCurveConfig{
+					Sensor: "sensor",
+					Min:    0,
+					Max:    100,
+				},
+			},
+		},
+		Sensors: []SensorConfig{
+			{
+				ID: "sensor",
+				File: &FileSensorConfig{
+					// TODO: path empty validation
+					Path: "",
+				},
+			},
+		},
+	}
+
+	// WHEN
+	err := validateConfig(&config, "")
+
+	// THEN
+	assert.EqualError(t, err, fmt.Sprintf("Duplicate curve id detected: %s", curveId))
+}
+
 func TestValidateCurve(t *testing.T) {
 	// GIVEN
 	config := Configuration{
@@ -299,3 +390,30 @@ func TestValidateSensor(t *testing.T) {
 	// THEN
 	assert.NoError(t, err)
 }
+
+func TestValidateDuplicateSensorId(t *testing.T) {
+	// GIVEN
+	sensorId := "sensor"
+	config := Configuration{
+		Sensors: []SensorConfig{
+			{
+				ID: sensorId,
+				File: &FileSensorConfig{
+					Path: "",
+				},
+			},
+			{
+				ID: sensorId,
+				File: &FileSensorConfig{
+					Path: "",
+				},
+			},
+		},
+	}
+
+	// WHEN
+	err := validateConfig(&config, "")
+
+	// THEN
+	assert.EqualError(t, err, fmt.Sprintf("Duplicate sensor id detected: %s", sensorId))
+}