incorrect variable replacement in node_action causes core dump

                        bbs.replace_text(708,"%s at Multi Relay Chat %s");
                        bbs.node_action = NODE_BXFR;
                        bbs.nodesync();
                        bbs.revert_text(708);
                        bbs.exec("?../xtrn/mrc/mrc-client.js",null,"/sbbs/xtrn/mrc/");

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
--Type <RET> for more, q to quit, c to continue without paging--c
Core was generated by `/sbbs/exec/sbbs d'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-vec.S:126
126     ../sysdeps/x86_64/multiarch/strlen-vec.S: No such file or directory.
[Current thread is 1 (Thread 0x7ff1527fc640 (LWP 1052439))]
(gdb) bt
#0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-vec.S:126
#1  0x00007ff1c7c1cdb1 in __vfprintf_internal (s=s@entry=0x7ff1527f01a0, format=format@entry=0x7ff14816de70 "%s at Multi Relay Chat %s",
    ap=ap@entry=0x7ff1527f02e0, mode_flags=mode_flags@entry=0) at ./stdio-common/vfprintf-internal.c:1517
#2  0x00007ff1c7c27a09 in __vsprintf_internal (string=0x7ff1527f04e0 "Nelgin at Multi Relay Chat ", maxlen=maxlen@entry=18446744073709551615,
    format=0x7ff14816de70 "%s at Multi Relay Chat %s", args=args@entry=0x7ff1527f02e0, mode_flags=mode_flags@entry=0) at ./libio/iovsprintf.c:95
#3  0x00007ff1c7c069a8 in __sprintf (s=<optimized out>, format=<optimized out>) at ./stdio-common/sprintf.c:30
#4  0x00007ff1c810dab3 in sbbs_t::putnodedat (this=0x7ff1b4503ac0, number=1, node=0x7ff1b450f7b0) at putnode.cpp:51
#5  0x00007ff1c7fe9640 in sbbs_t::nodesync (this=0x7ff1b4503ac0, clearline=false) at getnode.cpp:126
#6  0x00007ff1c7ffce2d in js_nodesync (cx=0x7ff14806e6e0, argc=0, arglist=0x7ff1600000a0) at js_bbs.cpp:1282
#7  0x00007ff1c84480c7 in js::CallJSNative (vp=0x7ff1600000a0, argc=0, native=0x7ff1c7ffccbc <js_nodesync(JSContext*, uintN, jsval*)>,
    cx=0x7ff14806e6e0) at /home/bbs/sbbs-test/repo/3rdp/src/mozjs/js-1.8.5/js/src/jscntxtinlines.h:701
#8  js::Interpret (cx=0x7ff14806e6e0, entryFrame=0x7ff160000048, inlineCallCount=0, interpMode=JSINTERP_NORMAL) at jsinterp.cpp:4799
#9  0x00007ff1c823a5c6 in js::RunScript (cx=0x7ff14806e6e0, script=0x7ff1481eeea0, fp=0x7ff160000048)
    at /home/bbs/sbbs-test/repo/3rdp/src/mozjs/js-1.8.5/js/src/jsinterp.cpp:653
#10 0x00007ff1c823d55f in js::Execute (cx=0x7ff14806e6e0, chain=0x7ff15169ac60, script=0x7ff1481eeea0, prev=0x0, flags=0, result=0x7ff1527f5078)
    at /home/bbs/sbbs-test/repo/3rdp/src/mozjs/js-1.8.5/js/src/jsinterp.cpp:1028
#11 0x00007ff1c819e3a1 in JS_ExecuteScript (cx=0x7ff14806e6e0, obj=0x7ff15169ac60, scriptObj=0x7ff15169aca8, rval=0x7ff1527f5078) at jsapi.cpp:4998
#12 0x00007ff1c7fc1971 in sbbs_t::js_execfile (this=0x7ff1b4503ac0, cmd=0x7ff1527fa920 "eotl_chat", startup_dir=0x0, scope=0x0,
    js_cx=0x7ff14806e6e0, js_glob=0x7ff151603048) at exec.cpp:676
#13 0x00007ff1c7fc2014 in sbbs_t::exec_bin (this=0x7ff1b4503ac0, cmdline=0x7ff1527fa920 "eotl_chat", csi=0x7ff1b4515d98, startup_dir=0x0)
    at exec.cpp:770
#14 0x00007ff1c7fc43ef in sbbs_t::exec (this=0x7ff1b4503ac0, csi=0x7ff1b4515d98) at exec.cpp:1331
#15 0x00007ff1c80e2938 in node_thread (arg=0x7ff1b4503ac0) at main.cpp:4305
#16 0x00007ff1c7c3ab43 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
#17 0x00007ff1c7ccca00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81