--- UIxMailPartEncryptedViewer.m.orig	2019-08-20 10:41:50.994186817 +0200
+++ UIxMailPartEncryptedViewer.m	2019-08-20 10:42:09.798051760 +0200
@@ -93,7 +93,7 @@
 
 - (NSData *) _processMessageWith: (NSData *) signedData
 {
-  NSData *output;
+  NSData *output = NULL;
 
   STACK_OF(X509) *certs;
   X509_STORE *x509Store;