diff --git a/src/tpm2/NVMarshal.c b/src/tpm2/NVMarshal.c
index 1b65116df..122d4dff0 100644
--- a/src/tpm2/NVMarshal.c
+++ b/src/tpm2/NVMarshal.c
@@ -5109,6 +5109,7 @@ PERSISTENT_ALL_Marshal(BYTE **buffer, INT32 *size)
                                 PERSISTENT_ALL_MAGIC, blob_version);
     if (blob_version >= 4) {
         profileJSON = RuntimeProfileGetJSON(RuntimeProfile);
+        assert(profileJSON);
         written += String_Marshal(profileJSON, buffer, size); // since v4
     }
     written += PACompileConstants_Marshal(buffer, size);