diff --git a/src/shared/ModelBaseMysql.lua b/src/shared/ModelBaseMysql.lua
index e2a2978..d997c4e 100644
--- a/src/shared/ModelBaseMysql.lua
+++ b/src/shared/ModelBaseMysql.lua
@@ -485,6 +485,8 @@ function ModelBaseMysql:updateFields(fields)
             if next(value) then 
                 local result = mysqlproxy:quote_sql_str(MsgPack.pack(value))
                 params[field] = result
+            else
+                params[field] = mysqlproxy:quote_sql_str(MsgPack.pack({}))
             end
         elseif self.class.schema[field][1] == "string" then
             local result = mysqlproxy:quote_sql_str(value)
--
libgit2 0.21.2