1 files changed, 1 insertions, 1 deletions
diff --git a/value/src/main/java/com/google/auto/value/processor/MissingTypes.java b/value/src/main/java/com/google/auto/value/processor/MissingTypes.java
index ea8126b5..8bc0119e 100644
--- a/value/src/main/java/com/google/auto/value/processor/MissingTypes.java
+++ b/value/src/main/java/com/google/auto/value/processor/MissingTypes.java
@@ -54,7 +54,7 @@ final class MissingTypes {
       // Although it is not specified as such, in practice ErrorType.toString() is the type name
       // that appeared in the source code. Showing it here can help in debugging issues with
       // deferral.
-      super(missingType == null ? null : missingType.toString());
+      super(missingType == null ? "" : missingType.toString());
     }
   }