Index: src/diff.c
==================================================================
--- src/diff.c
+++ src/diff.c
@@ -1504,10 +1504,11 @@
         /* Webserver */
         maxwidth = 0;
         blob_zero(&dump);
         sbsDiff(&c, &dump, nContext, width, escHtml);
         width = maxwidth;
+        blob_reset(&dump);
       }
       sbsDiff(&c, pOut, nContext, width, escHtml);
     }else{
       int showLn = (diffFlags & DIFF_LINENO)!=0;
       contextDiff(&c, pOut, nContext, showLn, escHtml);