gumbo crash

valgrind

==8544== 
==8544== Invalid read of size 8
==8544==    at 0x4FD4B87: MVM_nativecall_refresh (nativecall.c:753)
==8544==    by 0x4FD6BCD: MVM_nativecall_invoke (nativecall_dyncall.c:780)
==8544==    by 0x4FAFECA: MVM_interp_run (interp.c:3994)
==8544==    by 0x5073838: MVM_vm_run_file (moar.c:310)
==8544==    by 0x109102: main (main.c:212)
==8544==  Address 0xca5c1a0 is 0 bytes inside a block of size 32 free'd
==8544==    at 0x4C2CDDB: free (vg_replace_malloc.c:530)
==8544==    by 0xD7729A0: gumbo_destroy_output (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)
==8544==    by 0x507A2DC: ??? (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xFFEFFFB3F: ???
==8544==    by 0x507A215: dc_callvm_call_x64 (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xD77292F: ??? (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)
==8544==    by 0xBEEA38F: ???
==8544==    by 0xBEEA38F: ???
==8544==    by 0xBEEA38F: ???
==8544==    by 0xFFEFFFB5F: ???
==8544==    by 0x5079B88: dcCallVoid (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xD77292F: ??? (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)
==8544==  Block was alloc'd at
==8544==    at 0x4C2BBAF: malloc (vg_replace_malloc.c:299)
==8544==    by 0xD7719F7: gumbo_parse_with_options (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)
==8544==    by 0x507A2DC: ??? (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xFFEFFFB3F: ???
==8544==    by 0x507A215: dc_callvm_call_x64 (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xD7728CF: ??? (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)
==8544==    by 0xCA5A06F: ???
==8544==    by 0xCA5A06F: ???
==8544==    by 0xCA5A06F: ???
==8544==    by 0xFFEFFFB5F: ???
==8544==    by 0x5079D41: dcCallPointer (in /home/alex/git/rakudo/install/lib/libmoar.so)
==8544==    by 0xD7728CF: ??? (in /usr/lib/x86_64-linux-gnu/libgumbo.so.1.0.0)