diff --git a/x/lightclient/types/genesis.go b/x/lightclient/types/genesis.go
index d12d11eae..e2560484e 100644
--- a/x/lightclient/types/genesis.go
+++ b/x/lightclient/types/genesis.go
@@ -9,13 +9,37 @@ func DefaultGenesisState() GenesisState {
 }
 
 func (g GenesisState) Validate() error {
+
+	clientSet := make(map[string]struct{})
 	for _, client := range g.CanonicalClients {
 		if client.RollappId == "" {
-			return fmt.Errorf("invalid rollapp id: %v", client)
+			return fmt.Errorf("invalid rollapp_id: %v", client)
 		}
 		if client.IbcClientId == "" {
-			return fmt.Errorf("invalid ibc client id: %v", client)
+			return fmt.Errorf("invalid ibc_client_id: %v", client)
+		}
+
+		clientKey := client.RollappId + ":" + client.IbcClientId
+		if _, exists := clientSet[clientKey]; exists {
+			return fmt.Errorf("duplicate canonical client found: %v", client)
+		}
+		clientSet[clientKey] = struct{}{}
+	}
+
+	signerSet := make(map[string]struct{})
+	for _, signer := range g.HeaderSigners {
+		if signer.SequencerAddress == "" {
+			return fmt.Errorf("invalid sequencer address: %v", signer)
+		}
+		if signer.ClientId == "" {
+			return fmt.Errorf("invalid client id: %v", signer)
+		}
+
+		signerKey := signer.SequencerAddress + ":" + fmt.Sprint(signer.Height)
+		if _, exists := signerSet[signerKey]; exists {
+			return fmt.Errorf("duplicate signer entry found: %v", signer)
 		}
+		signerSet[signerKey] = struct{}{}
 	}
 
 	return nil
diff --git a/x/lightclient/types/genesis_test.go b/x/lightclient/types/genesis_test.go
index e5711c968..1c8fafa66 100644
--- a/x/lightclient/types/genesis_test.go
+++ b/x/lightclient/types/genesis_test.go
@@ -52,6 +52,44 @@ func TestGenesisValidate(t *testing.T) {
 			g:     types.DefaultGenesisState(),
 			valid: true,
 		},
+		{
+			name: "duplicate canonical client",
+			g: types.GenesisState{
+				CanonicalClients: []types.CanonicalClient{
+					{RollappId: "rollapp-1", IbcClientId: "client-1"},
+					{RollappId: "rollapp-1", IbcClientId: "client-1"},
+				},
+			},
+			valid: false,
+		},
+		{
+			name: "duplicate header signer",
+			g: types.GenesisState{
+				HeaderSigners: []types.HeaderSignerEntry{
+					{SequencerAddress: "sequencer1", ClientId: "client1", Height: 100},
+					{SequencerAddress: "sequencer1", ClientId: "client1", Height: 100},
+				},
+			},
+			valid: false,
+		},
+		{
+			name: "empty sequencer address in header signer",
+			g: types.GenesisState{
+				HeaderSigners: []types.HeaderSignerEntry{
+					{SequencerAddress: "", ClientId: "client1", Height: 100},
+				},
+			},
+			valid: false,
+		},
+		{
+			name: "empty client id in header signer",
+			g: types.GenesisState{
+				HeaderSigners: []types.HeaderSignerEntry{
+					{SequencerAddress: "sequencer1", ClientId: "", Height: 100},
+				},
+			},
+			valid: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {