--- include/shmbutil.h.orig	2002-08-05 06:26:13.000000000 +0900
+++ include/shmbutil.h	2002-08-05 06:19:37.000000000 +0900
@@ -120,6 +120,8 @@
 		state = state_bak; \
 		(_i)++; \
 	      } \
+            else if (mblength == 0) \
+              (_i)++; \
 	    else \
 	      (_i) += mblength; \
 	  } \