diff --git a/Controller/CropController.lua b/Controller/CropController.lua
index 4963a07..3fcc698 100644
--- a/Controller/CropController.lua
+++ b/Controller/CropController.lua
@@ -38,7 +38,7 @@ function CropController:toMatrix(str)
                 end
             end
         end
-        matrix[#matrix+1] = toMatrix(str:sub(lastC + 1, len))
+        matrix[#matrix+1] = self:toMatrix(str:sub(lastC + 1, len))
         return matrix
     end