Record Case Detail

This function is in beta test. Please help improve it in the issues here.

10 str
0 print
1 append NU7lXPGFsMY4c 9rTQ3
/in/dlist.c:125:14: runtime error: member access within null pointer of type 'node_t' (aka 'struct _node_')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /in/dlist.c:125:14 in 
AddressSanitizer:DEADLYSIGNAL
=================================================================
==114==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010 (pc 0x000000516b1f bp 0x7fffa68199d0 sp 0x7fffa68198e0 T0)
==114==The signal is caused by a WRITE memory access.
==114==Hint: address points to the zero page.
    #0 0x516b1e  (/out/package/main+0x516b1e)
    #1 0x519965  (/out/package/main+0x519965)
    #2 0x5152d7  (/out/package/main+0x5152d7)
    #3 0x7ff8072c3b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x41ca79  (/out/package/main+0x41ca79)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/out/package/main+0x516b1e) 
==114==ABORTING

Your answer may be identical to the JOJ answer in the first several lines.

However, the main problem you meet now is Runtime Error. And the exit code of your program is 1, which should be 0.

Please double check your code to solve this problem and try again.

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NU7lXPGFsMY4c=9rTQ3
pn6YT=6GYaq
GVacjbsA0=WITG
5BHyuqkgI0pvA=uemH
od95SR7fUu=V32tu
T41K8vRYxiS=78QD
uNh0R1gO=kuUH9
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NU7lXPGFsMY4c=9rTQ3
pn6YT=6GYaq
GVacjbsA0=WITG
5BHyuqkgI0pvA=uemH
od95SR7fUu=V32tu
T41K8vRYxiS=78QD
uNh0R1gO=kuUH9

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JOJ Answer