diff --git a/infra/modules/key-vault.bicep b/infra/modules/key-vault.bicep
index 09cfedc3..b262f677 100644
--- a/infra/modules/key-vault.bicep
+++ b/infra/modules/key-vault.bicep
@@ -89,7 +89,7 @@ module avmKeyVault 'br/public:avm/res/key-vault/vault:0.13.0' = {
     enableRbacAuthorization: enableRbacAuthorization
     createMode: createMode
     enableTelemetry: enableTelemetry
-    diagnosticSettings: [{ workspaceResourceId: logAnalyticsWorkspaceResourceId }]
+    diagnosticSettings: empty(logAnalyticsWorkspaceResourceId) ? null : [{ workspaceResourceId: logAnalyticsWorkspaceResourceId }]
     networkAcls: networkAcls
   }
 }