diff --git a/dlls/jscript/array.c b/dlls/jscript/array.c
index 43cc61fd151..c4d7399c50b 100644
--- a/dlls/jscript/array.c
+++ b/dlls/jscript/array.c
@@ -433,9 +433,10 @@ static HRESULT Array_sort(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS
 
 
         cmp_func = iface_to_jsdisp((IUnknown*)V_DISPATCH(arg));
-        if(!is_class(cmp_func, JSCLASS_FUNCTION)) {
+        if(!cmp_func || !is_class(cmp_func, JSCLASS_FUNCTION)) {
             WARN("cmp_func is not a function\n");
-            jsdisp_release(cmp_func);
+            if(cmp_func)
+                jsdisp_release(cmp_func);
             return E_FAIL;
         }
     }