Index: gdb/cp-support.c
===================================================================
RCS file: /cvs/src/src/gdb/cp-support.c,v
retrieving revision 1.26
diff -u -p -r1.26 cp-support.c
--- gdb/cp-support.c	1 Jan 2008 22:53:09 -0000	1.26
+++ gdb/cp-support.c	19 Mar 2008 19:07:54 -0000
@@ -892,8 +892,14 @@ maint_cplus_command (char *arg, int from
 static void
 first_component_command (char *arg, int from_tty)
 {
-  int len = cp_find_first_component (arg);
-  char *prefix = alloca (len + 1);
+  int len;  
+  char *prefix; 
+
+  if (!arg)
+    return;
+
+  len = cp_find_first_component (arg);
+  prefix = alloca (len + 1);
 
   memcpy (prefix, arg, len);
   prefix[len] = '\0';