ext/ruby_prof.c in ruby-prof-0.7.9 vs ext/ruby_prof.c in ruby-prof-0.7.10

@@ -147,12 +147,11 @@
         result = rb_String(ID2SYM(mid));
     
     if (depth > 0)
     {
       char buffer[65];
-      sprintf(buffer, "d%i", depth);
-      rb_str_cat2(result, "-");
+      sprintf(buffer, "(d%i)", depth);
       rb_str_cat2(result, buffer);
     }
 
     return result;
 }
@@ -1206,10 +1205,10 @@
 #ifdef RUBY_VM
           // we need to walk up the stack to find the right one [http://redmine.ruby-lang.org/issues/show/2610] (for now)
           // sometimes frames don't have line and source somehow [like blank]
           // if we hit one there's not much we can do...I guess...
           // or maybe we don't have one because we're at the top or something.
-        while( frame->call_info->target->key->mid && frame->call_info->target->key->klass && ((frame->call_info->target->key->mid != mid) || (frame->call_info->target->key->klass != klass))){
+        while( frame && frame->call_info->target->key->mid && frame->call_info->target->key->klass && ((frame->call_info->target->key->mid != mid) || (frame->call_info->target->key->klass != klass))){
            frame = pop_frame(thread_data, now);
          }      
 #endif
         break;
       }