cbc-connstr segfaults on trying to access Connspec fields

(gdb) run connstr couchbase://localhost:9000

Starting program: /usr/bin/cbc connstr couchbase://localhost:9000

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.

std::string::assign (this=0x7fffffffcd28, __s=0x67d2a8 "couchbase://localhost:9000", __n=0x1a) at /usr/src/debug/gcc-7.2.1-20170915/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/basic_string.tcc:712

712	      _M_check_length(this->size(), __n, "basic_string::assign");

(gdb) bt

#0  std::string::assign (this=0x7fffffffcd28, __s=0x67d2a8 "couchbase://localhost:9000", __n=0x1a) at /usr/src/debug/gcc-7.2.1-20170915/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/basic_string.tcc:712

#1  0x00007ffff7b4af63 in std::string::assign (__s=0x67d2a8 "couchbase://localhost:9000", this=0x7fffffffcd28) at /usr/include/c++/4.8.2/bits/basic_string.h:1131

#2  std::string::operator= (__s=0x67d2a8 "couchbase://localhost:9000", this=0x7fffffffcd28) at /usr/include/c++/4.8.2/bits/basic_string.h:555

#3  lcb::Connspec::parse (this=this@entry=0x7fffffffccf0, connstr_=0x67d2a8 "couchbase://localhost:9000", errmsg=errmsg@entry=0x7fffffffcc48) at /usr/src/debug/libcouchbase-2.8.1/src/connspec.cc:292

#4  0x0000000000410574 in cbc::ConnstrHandler::run (this=<optimized out>) at /usr/src/debug/libcouchbase-2.8.1/tools/cbc.cc:1455

#5  0x000000000040ac10 in cbc::Handler::execute (this=0x677ca0, argc=argc@entry=0x2, argv=argv@entry=0x7fffffffdb20) at /usr/src/debug/libcouchbase-2.8.1/tools/cbc.cc:353

#6  0x0000000000407e63 in main (argc=0x2, argv=0x7fffffffdb20) at /usr/src/debug/libcouchbase-2.8.1/tools/cbc.cc:1790