only perform modulo if the tile is not -1

1 files changed, 5 insertions, 5 deletions

diff --git a/tools/nitrogfx/json.c b/tools/nitrogfx/json.c
index 7907b515..53f83ceb 100644
--- a/tools/nitrogfx/json.c
+++ b/tools/nitrogfx/json.c
@@ -194,13 +194,13 @@ struct JsonToScreenOptions *ParseNSCRJson(char *path)
         cJSON_ArrayForEach(tile, data)
         {
             int tileInt = GetInt(tile) - 1;
-            if (tilesetSize != 0)
-            {
-                palette = tileInt / tilesetSize;
-                tileInt %= tilesetSize;
-            }
             if (tileInt != -1)
             {
+                if (tilesetSize != 0)
+                {
+                    palette = tileInt / tilesetSize;
+                    tileInt %= tilesetSize;
+                }
                 bool vFlip = tileInt >> 30;
                 bool hFlip = tileInt >> 31;
                 tileInt |= vFlip << 11;