From 70df4c1acf569c5db05480d0a0a1987d37b08246 Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Tue, 29 Jan 2019 21:39:11 -1100
Subject: [PATCH] '-'

---
 src/cc/sudoku.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cc/sudoku.cpp b/src/cc/sudoku.cpp
index 3cb9469f1..06bc35db6 100644
--- a/src/cc/sudoku.cpp
+++ b/src/cc/sudoku.cpp
@@ -821,7 +821,7 @@ UniValue sudoku_solution(uint64_t txfee,struct CCcontract_info *cp,cJSON *params
                                 {
                                     for (i=0; i<81; i++)
                                     {
-                                        if ( unsolved[i] == 0 )
+                                        if ( unsolved[i] < '1' || unsolved[i] > '9')
                                             continue;
                                         else if ( unsolved[i] != solution[i] )
                                         {