ServerRewards error still in 1.0.7

Hey, unfortunately the error when using Server Rewards as payment methode persists with new version 1.0.7:

Quote

Failed to call hook 'Upgrade' on plugin 'QuarryLevels v1.0.7' (InvalidCastException: Null object cannot be converted to a value type.)

at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in <fb001e01371b4adca20013e0ac763896>:0

at System.Convert.ChangeType (System.Object value, System.Type conversionType) [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0

at Oxide.Core.Plugins.Plugin.Call[T] (System.String hook, System.Object[] args) [0x00008] in <99d545163fdd4d57a562df7989f2ca0a>:0

at Oxide.Plugins.QuarryLevels.Upgrade (ConsoleSystem+Arg arg) [0x000fa] in <52c4b90e44c1481dbbb321b8850094d1>:0

at Oxide.Plugins.QuarryLevels.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0050d] in <52c4b90e44c1481dbbb321b8850094d1>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <cc99cb05b42e4ea494cdf294badea406>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <99d545163fdd4d57a562df7989f2ca0a>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <99d545163fdd4d57a562df7989f2ca0a>:0

Please advice on how to fix this...

Any update on the progress?