Xtightvnc 1.3.10-0ubuntu3 crash on Ubuntu 16.04

Xtightvnc-stacktrace_20210121-192418

$ *** Error in `Xtightvnc': free(): invalid pointer: 0x000000000085ea78 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777f5)[0x7f414c1127f5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8038a)[0x7f414c11b38a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f414c11f58c]
Xtightvnc(miSetShape+0x28f)[0x53fb6f]
Xtightvnc[0x540dee]
Xtightvnc[0x54102a]
Xtightvnc(Dispatch+0x1d0)[0x437a70]
Xtightvnc(main+0x7f5)[0x41e735]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f414c0bb840]
Xtightvnc(_start+0x29)[0x41e9b9]
======= Memory map: ========
00400000-0057e000 r-xp 00000000 103:06 2359400                           /usr/bin/Xtightvnc
0077d000-0077e000 r--p 0017d000 103:06 2359400                           /usr/bin/Xtightvnc
0077e000-00791000 rw-p 0017e000 103:06 2359400                           /usr/bin/Xtightvnc
00791000-007b4000 rw-p 00000000 00:00 0
0083f000-041b2000 rw-p 00000000 00:00 0                                  [heap]
7f413c000000-7f413c021000 rw-p 00000000 00:00 0
7f413c021000-7f4140000000 ---p 00000000 00:00 0
7f414075a000-7f4140f5a000 rw-s 00000000 00:05 53805133                   /SYSV00000000 (deleted)
7f4140f5a000-7f414105a000 rw-s 00000000 00:05 53739602                   /SYSV00000000 (deleted)
7f414105a000-7f41410ba000 rw-s 00000000 00:05 53608528                   /SYSV00000000 (deleted)
7f41410ba000-7f41414ba000 rw-s 00000000 00:05 53575759                   /SYSV00000000 (deleted)
7f4141b24000-7f4141b3a000 r-xp 00000000 103:06 528296                    /lib/x86_64-linux-gnu/libgcc_s.so.1
7f4141b3a000-7f4141d39000 ---p 00016000 103:06 528296                    /lib/x86_64-linux-gnu/libgcc_s.so.1
7f4141d39000-7f4141d3a000 rw-p 00015000 103:06 528296                    /lib/x86_64-linux-gnu/libgcc_s.so.1
7f4141d3a000-7f4149d3a000 rw-s 00000000 00:05 52854854                   /SYSV00000000 (deleted)
7f4149d90000-7f414a590000 rw-s 00000000 00:05 53182535                   /SYSV00000000 (deleted)
7f414a590000-7f414a610000 rw-s 00000000 00:05 53411916                   /SYSV00000000 (deleted)
7f414a610000-7f414a690000 rw-s 00000000 00:05 53280842                   /SYSV00000000 (deleted)
7f414a690000-7f414a69b000 r-xp 00000000 103:06 537797                    /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f414a69b000-7f414a89a000 ---p 0000b000 103:06 537797                    /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f414a89a000-7f414a89b000 r--p 0000a000 103:06 537797                    /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f414a89b000-7f414a89c000 rw-p 0000b000 103:06 537797                    /lib/x86_64-linux-gnu/libnss_files-2.23.so
7f414a89c000-7f414a8a2000 rw-p 00000000 00:00 0
7f414a8a2000-7f414a8ad000 r-xp 00000000 103:06 537807                    /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f414a8ad000-7f414aaac000 ---p 0000b000 103:06 537807                    /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f414aaac000-7f414aaad000 r--p 0000a000 103:06 537807                    /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f414aaad000-7f414aaae000 rw-p 0000b000 103:06 537807                    /lib/x86_64-linux-gnu/libnss_nis-2.23.so
7f414aaae000-7f414aac4000 r-xp 00000000 103:06 537743                    /lib/x86_64-linux-gnu/libnsl-2.23.so
7f414aac4000-7f414acc3000 ---p 00016000 103:06 537743                    /lib/x86_64-linux-gnu/libnsl-2.23.so
7f414acc3000-7f414acc4000 r--p 00015000 103:06 537743                    /lib/x86_64-linux-gnu/libnsl-2.23.so
7f414acc4000-7f414acc5000 rw-p 00016000 103:06 537743                    /lib/x86_64-linux-gnu/libnsl-2.23.so
7f414acc5000-7f414acc7000 rw-p 00000000 00:00 0
7f414acc7000-7f414accf000 r-xp 00000000 103:06 537805                    /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f414accf000-7f414aece000 ---p 00008000 103:06 537805                    /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f414aece000-7f414aecf000 r--p 00007000 103:06 537805                    /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f414aecf000-7f414aed0000 rw-p 00008000 103:06 537805                    /lib/x86_64-linux-gnu/libnss_compat-2.23.so
7f414aed0000-7f414b2d0000 rw-s 00000000 00:05 52822085                   /SYSV00000000 (deleted)
7f414b2d0000-7f414b350000 rw-s 00000000 00:05 52789316                   /SYSV00000000 (deleted)
7f414b350000-7f414b3d0000 rw-s 00000000 00:05 52625475                   /SYSV00000000 (deleted)
7f414b3d0000-7f414b5d0000 rw-s 00000000 00:05 52527170                   /SYSV00000000 (deleted)
7f414b5d0000-7f414b650000 rw-s 00000000 00:05 52494401                   /SYSV00000000 (deleted)
7f414b670000-7f414b6d0000 rw-s 00000000 00:05 52887612                   /SYSV00000000 (deleted)
7f414b6d0000-7f414b750000 rw-s 00000000 00:05 52232256                   /SYSV00000000 (deleted)
7f414b750000-7f414b7d0000 rw-s 00000000 00:05 51937339                   /SYSV00000000 (deleted)
7f414b7d0000-7f414c09b000 rw-p 00000000 00:00 0
7f414c09b000-7f414c25b000 r-xp 00000000 103:06 537726                    /lib/x86_64-linux-gnu/libc-2.23.so
7f414c25b000-7f414c45b000 ---p 001c0000 103:06 537726                    /lib/x86_64-linux-gnu/libc-2.23.so
7f414c45b000-7f414c45f000 r--p 001c0000 103:06 537726                    /lib/x86_64-linux-gnu/libc-2.23.so
7f414c45f000-7f414c461000 rw-p 001c4000 103:06 537726                    /lib/x86_64-linux-gnu/libc-2.23.so
7f414c461000-7f414c465000 rw-p 00000000 00:00 0
7f414c465000-7f414c4bc000 r-xp 00000000 103:06 2360729                   /usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2
7f414c4bc000-7f414c6bc000 ---p 00057000 103:06 2360729                   /usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2
7f414c6bc000-7f414c6bd000 r--p 00057000 103:06 2360729                   /usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2
7f414c6bd000-7f414c6be000 rw-p 00058000 103:06 2360729                   /usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2
7f414c6be000-7f414c7c6000 r-xp 00000000 103:06 537746                    /lib/x86_64-linux-gnu/libm-2.23.so
7f414c7c6000-7f414c9c5000 ---p 00108000 103:06 537746                    /lib/x86_64-linux-gnu/libm-2.23.so
7f414c9c5000-7f414c9c6000 r--p 00107000 103:06 537746                    /lib/x86_64-linux-gnu/libm-2.23.so
7f414c9c6000-7f414c9c7000 rw-p 00108000 103:06 537746                    /lib/x86_64-linux-gnu/libm-2.23.so
7f414c9c7000-7f414c9e0000 r-xp 00000000 103:06 524366                    /lib/x86_64-linux-gnu/libz.so.1.2.8
7f414c9e0000-7f414cbdf000 ---p 00019000 103:06 524366                    /lib/x86_64-linux-gnu/libz.so.1.2.8
7f414cbdf000-7f414cbe0000 r--p 00018000 103:06 524366                    /lib/x86_64-linux-gnu/libz.so.1.2.8
7f414cbe0000-7f414cbe1000 rw-p 00019000 103:06 524366                    /lib/x86_64-linux-gnu/libz.so.1.2.8
7f414cbe1000-7f414cc07000 r-xp 00000000 103:06 537787                    /lib/x86_64-linux-gnu/ld-2.23.so
7f414cc57000-7f414ccd7000 rw-s 00000000 00:05 51839033                   /SYSV00000000 (deleted)
7f414ccd7000-7f414cd57000 rw-s 00000000 00:05 51740717                   /SYSV00000000 (deleted)
7f414cd57000-7f414cdd7000 rw-s 00000000 00:05 51642414                   /SYSV00000000 (deleted)
7f414cdd7000-7f414cddc000 rw-p 00000000 00:00 0
7f414ce02000-7f414ce03000 rw-p 00000000 00:00 0
7f414ce03000-7f414ce06000 rw-s 00000000 00:05 53051465                   /SYSV00000000 (deleted)
7f414ce06000-7f414ce07000 r--p 00025000 103:06 537787                    /lib/x86_64-linux-gnu/ld-2.23.so
7f414ce07000-7f414ce08000 rw-p 00026000 103:06 537787                    /lib/x86_64-linux-gnu/ld-2.23.so
7f414ce08000-7f414ce09000 rw-p 00000000 00:00 0
7fff39e06000-7fff39ead000 rw-p 00000000 00:00 0                          [stack]
7fff39f24000-7fff39f26000 r--p 00000000 00:00 0                          [vvar]
7fff39f26000-7fff39f28000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]