diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/StorageBusBlockEntity.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/StorageBusBlockEntity.kt
index 25277c481..2189e13b6 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/StorageBusBlockEntity.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/StorageBusBlockEntity.kt
@@ -279,7 +279,8 @@ class StorageBusBlockEntity(blockPos: BlockPos, blockState: BlockState) : Matter
 				} else {
 					// shrink
 					for (i in parent.slots until scanned.size) {
-						removeTracked(i)
+						if (scannedMap[i] != null)
+							removeTracked(i)
 					}
 
 					scanned = arrayOfNulls(parent.slots)