fix segfault on empty eval

diff --git a/phpdbg_prompt.c b/phpdbg_prompt.c
index a690f5226802c4891b023128ef2004e981ff0460..2377a14f07fe167f5feeea7e6fcc3d2520c12726 100644 (file)
--- a/phpdbg_prompt.c
+++ b/phpdbg_prompt.c
@@ -146,7 +146,7 @@ static PHPDBG_COMMAND(eval) /* {{{ */
 {
        zval retval;
 
-       if (expr) {
+       if (expr_len) {
                if (zend_eval_stringl((char*)expr, expr_len-1,
                        &retval, "eval()'d code" TSRMLS_CC) == SUCCESS) {
                        zend_print_zval_r(&retval, 0 TSRMLS_CC);