A funny bug in php that can fit into one tweet again, not security bug since most likely in parsing

<?php
''+$jcase=$$FAKR=ETA;$D=$$D->WEN=&$RELES;$D->D->JELBREK^=''
?>

Crash

➜  php ./php-5.6.24/sapi/cli/php -f test.php

Warning: Attempt to modify property of non-object in /home/bob/VulnResearch/php/test.php on line 1

Warning: Creating default object from empty value in /home/bob/VulnResearch/php/test.php on line 1
ASAN:DEADLYSIGNAL
=================================================================
==14440==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000009 (pc 0x00000165e5c6 bp 0x00000060209f sp 0x7ffe3ad39960 T0)
    #0 0x165e5c5  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x165e5c5)
    #1 0x1563fbe  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x1563fbe)
    #2 0x16000a4  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x16000a4)
    #3 0x16004c1  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x16004c1)
    #4 0x1564883  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x1564883)
    #5 0x15bbd60  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x15bbd60)
    #6 0x13b1db3  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x13b1db3)
    #7 0x1918b2b  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x1918b2b)
    #8 0x1914f5f  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x1914f5f)
    #9 0x7f5ed51d682f  (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #10 0x45dee8  (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x45dee8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/bob/VulnResearch/php/php-5.6.24/sapi/cli/php+0x165e5c5) 
==14440==ABORTING