Quartus quit unexpectedly

I am using Quartus 18.0.1 and it quit unexpectedly several times today during synthesis and analysis step with the following error message. Any idea how to deal with this?

Problem Details

Error:

*** Fatal Error: Access Violation at 00007FF95F2F9CA8

Module: quartus_syn.exe

Stack Trace:

0x39ca7: HDB_DESIGN_UNIT::get_library + 0x2b (DB_HDB)

0x36512: QIS_RTL_STAGE::IMPL::process_pre_compiled_partition + 0x302 (synth_qis)

0x32310: QIS_RTL_STAGE::IMPL::elaborate + 0x1a0 (synth_qis)

0x4e1cf: QIS_RTL_RECURSIVE_ELABORATION::after_elaboration + 0x7f (synth_qis)

0x339e0: QIS_RTL_STAGE::IMPL::elaborate + 0x1870 (synth_qis)

0x4e1cf: QIS_RTL_RECURSIVE_ELABORATION::after_elaboration + 0x7f (synth_qis)

0x339e0: QIS_RTL_STAGE::IMPL::elaborate + 0x1870 (synth_qis)

0x4e1cf: QIS_RTL_RECURSIVE_ELABORATION::after_elaboration + 0x7f (synth_qis)

0x339e0: QIS_RTL_STAGE::IMPL::elaborate + 0x1870 (synth_qis)

0x16a68: qis_elaborate + 0x168 (synth_qis)

0x16442: TclNRRunCallbacks + 0x62 (tcl86)

0x17c4d: TclEvalEx + 0x9ed (tcl86)

0xa6a8b: Tcl_FSEvalFileEx + 0x22b (tcl86)

0xa5136: Tcl_EvalFile + 0x36 (tcl86)

0x13ab0: qexe_evaluate_tcl_script + 0x340 (comp_qexe)

0x12c8f: qexe_do_tcl + 0x33f (comp_qexe)

0x182ce: qexe_run_tcl_option + 0x5ee (comp_qexe)

0x243c3: qcu_run_tcl_option + 0xd43 (comp_qcu)

0x11d9: qsyn2_tcl_process_default_flow_option + 0xa9 (quartus_syn)

0x17bca: qexe_run + 0x3aa (comp_qexe)

0x18c63: qexe_standard_main + 0xb3 (comp_qexe)

0x40c9: qsyn2_main + 0x129 (quartus_syn)

0x13c58: msg_main_thread + 0x18 (CCL_MSG)

0x14f6e: msg_thread_wrapper + 0x6e (CCL_MSG)

0x1e920: mem_thread_wrapper + 0x70 (ccl_mem)

0x13041: msg_exe_main + 0xa1 (CCL_MSG)

0x5764: __scrt_common_main_seh + 0x11c (quartus_syn)

0x8363: BaseThreadInitThunk + 0x13 (KERNEL32)

0x6e820: RtlUserThreadStart + 0x20 (ntdll)

End-trace

Executable: quartus_syn

Comment:

None

System Information

Platform: windows64

OS name: Windows 10

OS version: 10.0

Quartus Prime Information

Address bits: 64

Version: 18.0.1

Build: 261

Edition: Pro Edition