*** ../bash-20180907/expr.c	2018-08-27 15:31:05.000000000 -0400
--- expr.c	2018-09-15 22:53:56.000000000 -0400
***************
*** 326,329 ****
--- 326,332 ----
    int aflags;
  
+   if (lhs == 0 || *lhs == 0)
+     return;		/* XXX */
+ 
  #if defined (ARRAY_VARS)
    aflags = (assoc_expand_once && already_expanded) ? ASS_NOEXPAND : 0;
***************
*** 1013,1017 ****
  	  else
  #endif
! 	    expr_bind_variable (tokstr, vincdec);
  	}
        free (vincdec);
--- 1016,1021 ----
  	  else
  #endif
! 	    if (tokstr)
! 	      expr_bind_variable (tokstr, vincdec);
  	}
        free (vincdec);