Crash when using custom colors about inklingreader HOT 4 CLOSED

(gdb) r --background="#ffffff"  --file ./test/tree.WPI --to ./test/tree-background.svg
Starting program: /Users/su_v/.local/bin/inklingreader --background="#ffffff"  --file ./test/tree.WPI --to ./test/tree-background.svg
Reading symbols for shared libraries ++++++++++++++++++.......................................................................................................................................................... done
inklingreader(65026) malloc: *** error for object 0x7fff5fbff83e: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

Program received signal SIGABRT, Aborted.
0x00007fff88d0782a in __kill ()
(gdb) bt full
#0  0x00007fff88d0782a in __kill ()
No symbol table info available.
#1  0x00007fff8dafaa9c in abort ()
No symbol table info available.
#2  0x00007fff8db5984c in free ()
No symbol table info available.
#3  0x0000000100006b69 in dt_configuration_cleanup (config=0x1000096d0) at src/datatypes/configuration.c:104
No locals.
#4  0x0000000100001bd0 in cleanup_configuration () at src/main.c:102
No locals.
#5  0x00007fff8dafa7d0 in __cxa_finalize ()
No symbol table info available.
#6  0x00007fff8dafa652 in exit ()
No symbol table info available.
#7  0x00000001000015cb in start ()
No symbol table info available.
(gdb) q