Address sanatizer error

[jhert0]

==9103==ERROR: AddressSanitizer: stack-use-after-return on address 0x7ffde7f03571 at pc 0x0000005d3b36 bp 0x7ffde7f034c0 sp 0x7ffde7f034b0
WRITE of size 1 at 0x7ffde7f03571 thread T0
#0 0x5d3b35 in dropdown_close (/usr/local/bin/utox+0x5d3b35)
#1 0x5f331b in close_dropdowns (/usr/local/bin/utox+0x5f331b)
#2 0x5f3355 in close_dropdowns (/usr/local/bin/utox+0x5f3355)
#3 0x5f3355 in close_dropdowns (/usr/local/bin/utox+0x5f3355)
#4 0x5f345f in reset_settings_controls (/usr/local/bin/utox+0x5f345f)
#5 0x5f34b1 in disable_all_setting_sub (/usr/local/bin/utox+0x5f34b1)
#6 0x5f3587 in button_settings_sub_ui_on_mup (/usr/local/bin/utox+0x5f3587)
#7 0x5d0e06 in button_mup (/usr/local/bin/utox+0x5d0e06)
#8 0x496d8e in panel_mup (/usr/local/bin/utox+0x496d8e)
#9 0x496e34 in panel_mup (/usr/local/bin/utox+0x496e34)
#10 0x496e34 in panel_mup (/usr/local/bin/utox+0x496e34)
#11 0x496e34 in panel_mup (/usr/local/bin/utox+0x496e34)
#12 0x496e34 in panel_mup (/usr/local/bin/utox+0x496e34)
#13 0x496e34 in panel_mup (/usr/local/bin/utox+0x496e34)
#14 0x5b475b in mouse_up (/usr/local/bin/utox+0x5b475b)
#15 0x5b56d9 in doevent (/usr/local/bin/utox+0x5b56d9)
#16 0x5c4ff0 in main (/usr/local/bin/utox+0x5c4ff0)
#17 0x7f2681aa2b6a in __libc_start_main ../csu/libc-start.c:308
#18 0x4159d9 in _start (/usr/local/bin/utox+0x4159d9)

Address 0x7ffde7f03571 is located in stack of thread T0 at offset 97 in frame
#0 0x5f31df in close_dropdowns (/usr/local/bin/utox+0x5f31df)

This frame has 1 object(s):
[32, 40) 'ch' <== Memory access at offset 97 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
(longjmp and C++ exceptions are supported)
SUMMARY: AddressSanitizer: stack-use-after-return (/usr/local/bin/utox+0x5d3b35) in dropdown_close
Shadow bytes around the buggy address:
0x10003cfd8650: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003cfd8660: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003cfd8670: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003cfd8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003cfd8690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10003cfd86a0: 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 00 f5 f5[f5]f5
0x10003cfd86b0: f5 f5 f5 f5 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
0x10003cfd86c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
0x10003cfd86d0: f1 f1 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 00
0x10003cfd86e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003cfd86f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==9103==ABORTING