diff --git a/Source/IGListKit/IGListAdapterUpdater.m b/Source/IGListKit/IGListAdapterUpdater.m
index b4e6bb12..0e9cb9d3 100644
--- a/Source/IGListKit/IGListAdapterUpdater.m
+++ b/Source/IGListKit/IGListAdapterUpdater.m
@@ -94,6 +94,7 @@
 
     if (!transaction) {
         // If we don't have enough information, we might not be able to create a transaction.
+        self.lastTransactionBuilder = nil;
         return;
     }