diff --git a/src/cli/main.rs b/src/cli/main.rs
index 67bd28e..ca419af 100644
--- a/src/cli/main.rs
+++ b/src/cli/main.rs
@@ -15,7 +15,7 @@ use clap::Parser as _;
 use cli::Cli;
 use dasp_sample::Sample;
 use hound::{SampleFormat, WavSpec, WavWriter};
-use log::{debug, info, warn};
+use log::{debug, error, info, warn};
 use rodio::{OutputStream, Sink, buffer::SamplesBuffer};
 
 use crate::cli::{ExportOpts, PlayOpts};
@@ -166,11 +166,11 @@ fn parse_and_compile(opts: &PlayOpts) -> anyhow::Result<Vec<f64>> {
     compiler
         .compile_all(tokens)
         .inspect(|v| {
-            for sample in v {
-                assert!(
-                    !sample.abs().is_nan(),
-                    "Waiter! There's a NaN in my samples!"
-                );
+            let is_nan = |sample| sample.abs().is_nan();
+            if v.iter().all(is_nan) {
+                error!("🎉 All your samples are NaN, you got yourself a \"Not a Song\" (NaS)!")
+            } else if v.iter().any(is_nan) {
+                error!("Waiter! There's a NaN in my samples!");
             }
         })
         .context("Failed to compile tokens to samples")