diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
index dd5d25f12..7d63a45e6 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt
@@ -930,7 +930,8 @@ object MatterManager {
 				}
 
 				if (accumulatedMatter == null || accumulatedComplexity == null) {
-					throw RuntimeException("This piece should be unreachable")
+					comment(item, TextComponent("${recipe.formattedName} ended up with undefined matter value and/or complexity (all inputs skipped)"))
+					return Result.MISSING
 				}
 
 				if (!accumulatedMatter.isPositive || accumulatedComplexity <= 0.0) {