diff --git a/src/lagrange.rs b/src/lagrange.rs
index ebf84e8..4118818 100644
--- a/src/lagrange.rs
+++ b/src/lagrange.rs
@@ -114,7 +114,7 @@ mod tests {
         }
 
         fn interpolate_evaluate_at_0_eq_evaluate_at(ys: Vec<u8>) -> TestResult {
-            if ys.len() > std::u8::MAX as usize {
+            if ys.is_empty() || ys.len() > std::u8::MAX as usize {
                 return TestResult::discard();
             }