diff --git a/inferium-server.lua b/inferium-server.lua
index 6798a32..ce33ba6 100644
--- a/inferium-server.lua
+++ b/inferium-server.lua
@@ -5,7 +5,7 @@ local inferium = require('libs/inferium')
 local inferiumConfig = require('config/inferium')
 
 local DEFAULT_HARVESTER_NAME = 'harvester'
-local VERSION = "2.1.0"
+local VERSION = "2.1.1"
 
 local PERSISTED_CONFIGS = '/data/inferium-configs'
 local UPGRADE_SCRIPT = '/upgrade.lua'
@@ -19,14 +19,42 @@ local defaultAvailableSeeds = {
 
 -- Persistance utils
 
+local function stringifyConfigs(configs)
+  local stringifiedConfigs = {}
+
+  for k, v in pairs(configs) do
+    stringifiedConfigs[k] = textutils.serialize(v)
+  end
+
+  return textutils.serialize(stringifiedConfigs)
+end
+
+local function parseConfigs(rawConfigs)
+  local configs = {}
+  local stringifiedConfigs = textutils.unserialize(rawConfigs)
+
+  for k, v in pairs(stringifiedConfigs) do
+    configs[k] = textutils.unserialize(v)
+  end
+
+  return configs
+end
+
 local savePersistedConfigs = function(configs)
+  local rawConfigs = nil
+  local ok, errMessage = pcall(function() rawConfigs =  stringifyConfigs(configs) end)
+
+  if not rawConfigs or not ok then
+    error('savePersistedConfigs stringify error: ' .. tostring(errMessage))
+  end
+
   local file = fs.open(PERSISTED_CONFIGS, 'w')
 
   if not file then
     error('savePersistedConfigs: cannot open ' .. PERSISTED_CONFIGS .. ' file!')
   end
 
-  file.write(textutils.serialize(configs))
+  file.write(rawConfigs)
   file.close()
 end
 
@@ -39,10 +67,10 @@ local readPersistedConfigs = function()
     return initialConfig
   end
 
-  local serializedConfigs = file.readAll()
+  local rawConfigs = file.readAll()
   file.close()
 
-  return textutils.unserialize(serializedConfigs)
+  return parseConfigs(rawConfigs)
 end
 
 -- State