- Remove checking for "previous" in PHP < 5.2, because it doesn't exi…

…st there.

SVN Rev: 3186

xdebug.c

@@ -2547,13 +2547,15 @@ void xdebug_throw_exception_hook(zval *exception TSRMLS_DC)
 		php_error(E_ERROR, "Your exception class uses incorrect types for common properties: 'message' and 'file' need to be a string and 'line' needs to be an integer.");
 	}
 
+#if (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION >= 2) || PHP_MAJOR_VERSION >= 6
 	previous_exception = zend_read_property(default_ce, exception, "previous", sizeof("previous")-1, 1 TSRMLS_CC);
 	if (previous_exception && Z_TYPE_P(previous_exception) != IS_NULL) {
 		xdebug_message_trace = zend_read_property(default_ce, previous_exception, "xdebug_message", sizeof("xdebug_message")-1, 1 TSRMLS_CC);
 		if (xdebug_message_trace && Z_TYPE_P(xdebug_message_trace) != IS_NULL) {
 			xdebug_str_add(&tmp_str, Z_STRVAL_P(xdebug_message_trace), 0);
 		}
 	}
+#endif
 	if (!PG(html_errors)) {
 		xdebug_str_addl(&tmp_str, "\n", 1, 0);
 	}