diff --git a/ext/tidy/tests/uninitialized.phpt b/ext/tidy/tests/uninitialized.phpt
new file mode 100644
index 00000000000..3533f0d3453
--- /dev/null
+++ b/ext/tidy/tests/uninitialized.phpt
@@ -0,0 +1,29 @@
+--TEST--
+Operations on uninitialized tidy object
+--SKIPIF--
+<?php if (!extension_loaded("tidy")) print "skip"; ?>
+--FILE--
+<?php
+
+$tidy = new tidy;
+try {
+    var_dump($tidy->getHtmlVer());
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+try {
+    var_dump($tidy->isXhtml());
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+try {
+    var_dump($tidy->isXml());
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+tidy object is not initialized
+tidy object is not initialized
+tidy object is not initialized
diff --git a/ext/tidy/tidy.c b/ext/tidy/tidy.c
index 0efa594b690..8d87bb980c1 100644
--- a/ext/tidy/tidy.c
+++ b/ext/tidy/tidy.c
@@ -59,6 +59,13 @@
 	}	\
 	obj = Z_TIDY_P(object);	\
 
+#define TIDY_FETCH_INITIALIZED_OBJECT \
+	TIDY_FETCH_OBJECT; \
+	if (!obj->ptdoc->initialized) { \
+		zend_throw_error(NULL, "tidy object is not initialized"); \
+		return; \
+	}
+
 #define TIDY_FETCH_ONLY_OBJECT	\
 	PHPTidyObj *obj;	\
 	TIDY_SET_CONTEXT; \
@@ -1229,7 +1236,7 @@ PHP_FUNCTION(tidy_get_status)
 /* {{{ Get the Detected HTML version for the specified document. */
 PHP_FUNCTION(tidy_get_html_ver)
 {
-	TIDY_FETCH_OBJECT;
+	TIDY_FETCH_INITIALIZED_OBJECT;
 
 	RETURN_LONG(tidyDetectedHtmlVersion(obj->ptdoc->doc));
 }
@@ -1238,7 +1245,7 @@ PHP_FUNCTION(tidy_get_html_ver)
 /* {{{ Indicates if the document is a XHTML document. */
 PHP_FUNCTION(tidy_is_xhtml)
 {
-	TIDY_FETCH_OBJECT;
+	TIDY_FETCH_INITIALIZED_OBJECT;
 
 	RETURN_BOOL(tidyDetectedXhtml(obj->ptdoc->doc));
 }
@@ -1247,7 +1254,7 @@ PHP_FUNCTION(tidy_is_xhtml)
 /* {{{ Indicates if the document is a generic (non HTML/XHTML) XML document. */
 PHP_FUNCTION(tidy_is_xml)
 {
-	TIDY_FETCH_OBJECT;
+	TIDY_FETCH_INITIALIZED_OBJECT;
 
 	RETURN_BOOL(tidyDetectedGenericXml(obj->ptdoc->doc));
 }