diff --git a/Dockerfile.rust b/Dockerfile.rust
index d1fdd997..2d94fe66 100644
--- a/Dockerfile.rust
+++ b/Dockerfile.rust
@@ -4,7 +4,7 @@ WORKDIR /build
 
 RUN apk add rustup build-base protoc
 # todo: arm64 target
-RUN rustup-init --default-host x86_64-unknown-linux-musl --default-toolchain stable --profile default -y
+RUN rustup-init --default-host x86_64-unknown-linux-musl --default-toolchain nightly-2024-08-20 --profile default -y
 
 ENV PATH=/root/.cargo/bin:$PATH
 ENV RUSTFLAGS='-C link-arg=-s'
diff --git a/lib/libpk/src/_config.rs b/lib/libpk/src/_config.rs
index d138df1b..298e603c 100644
--- a/lib/libpk/src/_config.rs
+++ b/lib/libpk/src/_config.rs
@@ -18,6 +18,7 @@ pub struct DiscordConfig {
     pub bot_token: String,
     pub client_secret: String,
     pub max_concurrency: u32,
+    #[serde(default)]
     pub cluster: Option<ClusterSettings>,
     pub api_base_url: Option<String>,
 
@@ -81,8 +82,11 @@ fn _json_log_default() -> bool {
 pub struct PKConfig {
     pub db: DatabaseConfig,
 
+    #[serde(default)]
     pub discord: Option<DiscordConfig>,
+    #[serde(default)]
     pub api: Option<ApiConfig>,
+    #[serde(default)]
     pub avatars: Option<AvatarsConfig>,
 
     #[serde(default = "_metrics_default")]
@@ -105,7 +109,8 @@ impl PKConfig {
 lazy_static! {
     #[derive(Debug)]
     pub static ref CONFIG: Arc<PKConfig> = {
-        if let Ok(var) = std::env::var("NOMAD_ALLOC_INDEX") {
+        if let Ok(var) = std::env::var("NOMAD_ALLOC_INDEX")
+            && std::env::var("pluralkit__discord__cluster__total_nodes").is_ok() {
             std::env::set_var("pluralkit__discord__cluster__node_id", var);
         }
 
diff --git a/lib/libpk/src/lib.rs b/lib/libpk/src/lib.rs
index c474bada..e1a9561c 100644
--- a/lib/libpk/src/lib.rs
+++ b/lib/libpk/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(let_chains)]
 use metrics_exporter_prometheus::PrometheusBuilder;
 use tracing_subscriber::EnvFilter;