diff --git a/source/engine/mecanisms.js b/source/engine/mecanisms.js
index 69cf8bdf7..699a80b79 100644
--- a/source/engine/mecanisms.js
+++ b/source/engine/mecanisms.js
@@ -716,6 +716,7 @@ export let mecanismLinearScale = (recurse, k, v) => {
 			({ de: min, à: max }) => roundedAssiette >= min && roundedAssiette <= max
 		)
 
+		if (!matchedTranche) return 0
 		return matchedTranche.taux.nodeValue * val(assiette)
 	}