diff --git a/jsvalue.c b/jsvalue.c
index bd5403a..0bf50f2 100644
--- a/jsvalue.c
+++ b/jsvalue.c
@@ -481,13 +481,24 @@ void js_newscript(js_State *J, js_Function *fun, js_Environment *scope)
 
 void js_newcfunctionx(js_State *J, js_CFunction cfun, const char *name, int length, void *data, js_Finalize finalize)
 {
-	js_Object *obj = jsV_newobject(J, JS_CCFUNCTION, J->Function_prototype);
+	js_Object *obj;
+
+	if (js_try(J)) {
+		if (finalize)
+			finalize(J, data);
+		js_throw(J);
+	}
+
+	obj = jsV_newobject(J, JS_CCFUNCTION, J->Function_prototype);
 	obj->u.c.name = name;
 	obj->u.c.function = cfun;
 	obj->u.c.constructor = NULL;
 	obj->u.c.length = length;
 	obj->u.c.data = data;
 	obj->u.c.finalize = finalize;
+
+	js_endtry(J);
+
 	js_pushobject(J, obj);
 	{
 		js_pushnumber(J, length);
@@ -534,6 +545,12 @@ void js_newuserdatax(js_State *J, const char *tag, void *data, js_HasProperty ha
 		prototype = js_toobject(J, -1);
 	js_pop(J, 1);
 
+	if (js_try(J)) {
+		if (finalize)
+			finalize(J, data);
+		js_throw(J);
+	}
+
 	obj = jsV_newobject(J, JS_CUSERDATA, prototype);
 	obj->u.user.tag = tag;
 	obj->u.user.data = data;
@@ -541,6 +558,9 @@ void js_newuserdatax(js_State *J, const char *tag, void *data, js_HasProperty ha
 	obj->u.user.put = put;
 	obj->u.user.delete = delete;
 	obj->u.user.finalize = finalize;
+
+	js_endtry(J);
+
 	js_pushobject(J, obj);
 }