@@ -481,11 +481,11 @@ str* subst_str(char *input, struct sip_msg* msg, struct subst_expr* se)

 		goto error;

 	}

 	res->s=pkg_malloc(len+1); /* space for null termination */

-	res->s[len]=0;

 	if (res->s==0){

 		LOG(L_ERR, "ERROR: subst_str: mem. allocation error (res->s)\n");

 		goto error;

 	}

+	res->s[len]=0;

 	res->len=len;

 	/* replace */