Minimserver crashes after updating to 0.8.3

[Spark58]

Error: unexpected exception java.lang.NullPointerException

I got this error (end red minimwatch icon) after upgrading Minimserver 0.8.2 to 0.8.3 strictly according to the installation instruction ("Updating MinimServer and Java").

My Setup: Minimserver running on QNAP TS-219P+, firmware: 4.1.1, Minimwatch running on laptop, Win 8.1

Before the current update I was running Minimserver version installed before June 2014 major changes to the MinimServer and Java packages for QNAP.

I succesfully concluded the update process (to Minimserver 0.8.3 and JRE_ARM 8.6.0) but failed to complete restarting the new version of Minimserver - the restarting process take few minutes and the red icon appears with error description: 'unexpected exception java.lang.NullPointerException'.

Attached is the last part of the MinimServer log file.

Please advise how to solve the problem