Design Space Explorer segmentation violation

Hi all,

recently I am experiencing a segmentation violation error when trying to compile a Quartus project with the DSE. The single compilation is completed correctly by Quartus, from Analysis&Syntheses to Timing Analysis. However when I launch DSE locally, requiring 10 different compilations, Quartus quits unexpectedly reporting the following error:

Problem Details
Error:

*** Fatal Error: Segment Violation at (nil)
Module: quartus_dsew
Stack Trace:
0x408f: IPC_COMMAND::parse_output(char const*, unsigned int) + 0xcb (ccl_ipc)
0x4804: IPC_COMMAND::run(std::string const&, std::string const&, bool, unsigned int*, std::string const&, bool) + 0x4ec (ccl_ipc)
0x66efe: CMPM_IPC_CLIENT::thread_proc(void*) + 0x47e (prj_cmpm)
0x602c: thr_final_wrapper + 0xc (ccl_thr)
0x407df: msg_thread_wrapper(void* (*)(void*), void*) + 0x62 (ccl_msg)
0xa559: mem_thread_wrapper(void* (*)(void*), void*) + 0x99 (ccl_mem)
0x8f92: err_thread_wrapper(void* (*)(void*), void*) + 0x27 (ccl_err)
0x63f2: thr_thread_wrapper + 0x15 (ccl_thr)
0x66d2: thr_thread_begin + 0x46 (ccl_thr)
0x76ba: start_thread + 0xca (pthread.so.0)
0x1074dd: clone + 0x6d (c.so.6)

End-trace

Quartus Prime Version 18.1.0 Build 625 09/12/2018 SJ Standard Edition

Executable: quartus_dsew
Comment:
None

System Information
Platform: linux64
OS name: Ubuntu 16.04.6
OS version: 16

Quartus Prime Information
Address bits: 64
Version: 18.1.0
Build: 625
Edition: Standard Edition

Has anyone encountered a similar issue?

The things that I have tried so far but unsuccessfully are:

• deleting db and incremental_db folders
• reducing the number of compilations
• allowing only 1 compilation at a time

Unfortunately I cannot update Quartus to a newer version.

Thank you