Index: src/vdbeaux.c
==================================================================
--- src/vdbeaux.c
+++ src/vdbeaux.c
@@ -849,19 +849,22 @@
       pMem->n = sprintf(pMem->z, "%.2x", pOp->p5);   /* P5 */
       pMem->type = SQLITE_TEXT;
       pMem->enc = SQLITE_UTF8;
       pMem++;
   
-      pMem->flags = MEM_Null;                       /* Comment */
 #ifdef SQLITE_DEBUG
       if( pOp->zComment ){
         pMem->flags = MEM_Str|MEM_Term;
         pMem->z = pOp->zComment;
         pMem->n = strlen(pMem->z);
         pMem->enc = SQLITE_UTF8;
-      }
+      }else
 #endif
+      {
+        pMem->flags = MEM_Null;                       /* Comment */
+        pMem->type = SQLITE_NULL;
+      }
     }
 
     p->nResColumn = 8 - 5*(p->explain-1);
     p->rc = SQLITE_OK;
     rc = SQLITE_ROW;