diff -ru a/xpath.c b/xpath.c --- a/xpath.c 2017-10-26 07:54:40.000000000 +0000 +++ b/xpath.c 2018-10-26 19:59:15.725601177 +0000 @@ -13337,9 +13337,8 @@ return(0); } xmlXPathBooleanFunction(ctxt, 1); - arg1 = valuePop(ctxt); - arg1->boolval &= arg2->boolval; - valuePush(ctxt, arg1); + if (ctxt->value != NULL) + ctxt->value->boolval &= arg2->boolval; xmlXPathReleaseObject(ctxt->context, arg2); return (total); case XPATH_OP_OR: @@ -13363,9 +13362,8 @@ return(0); } xmlXPathBooleanFunction(ctxt, 1); - arg1 = valuePop(ctxt); - arg1->boolval |= arg2->boolval; - valuePush(ctxt, arg1); + if (ctxt->value != NULL) + ctxt->value->boolval |= arg2->boolval; xmlXPathReleaseObject(ctxt->context, arg2); return (total); case XPATH_OP_EQUAL: