diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/MatteryMenu.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/MatteryMenu.kt
index 8330c2c6a..1d0727448 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/MatteryMenu.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/MatteryMenu.kt
@@ -782,11 +782,13 @@ abstract class MatteryMenu(
 		val allowedTypes = EnumMap<UpgradeType, BooleanSupplier>(UpgradeType::class.java)
 
 		for (value in UpgradeType.ALL) {
-			allowedTypes[value] = mSynchronizer.boolean().delegate.also {
+			val b = mSynchronizer.boolean().delegate.also {
 				if (container != null) {
 					it.accept(value in container.allowedUpgrades)
 				}
-			}::get as BooleanSupplier
+			}
+
+			allowedTypes[value] = BooleanSupplier { b.get() }
 		}
 
 		val syncContainer = container ?: SimpleContainer(count)