1 files changed, 2 insertions, 1 deletions
diff --git a/guava/src/com/google/common/collect/EnumMultiset.java b/guava/src/com/google/common/collect/EnumMultiset.java
index d6ced718b..04126f8aa 100644
--- a/guava/src/com/google/common/collect/EnumMultiset.java
+++ b/guava/src/com/google/common/collect/EnumMultiset.java
@@ -18,6 +18,7 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.collect.CollectPreconditions.checkNonnegative;
 import static com.google.common.collect.CollectPreconditions.checkRemove;
+import static java.util.Objects.requireNonNull;
 
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
@@ -309,7 +310,7 @@ public final class EnumMultiset<E extends Enum<E>> extends AbstractMultiset<E>
   private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
     stream.defaultReadObject();
     @SuppressWarnings("unchecked") // reading data stored by writeObject
-    Class<E> localType = (Class<E>) stream.readObject();
+    Class<E> localType = (Class<E>) requireNonNull(stream.readObject());
     type = localType;
     enumConstants = type.getEnumConstants();
     counts = new int[enumConstants.length];