diff --git a/xs/sources/xsArray.c b/xs/sources/xsArray.c
index fbcfe8af19..f59e33d745 100644
--- a/xs/sources/xsArray.c
+++ b/xs/sources/xsArray.c
@@ -2340,13 +2340,9 @@ void fx_Array_prototype_sort(txMachine* the)
 				mxTypeError("compare is no function");
 		}
 	}
-	if (function)
-		fxSortArrayItems(the, function, C_NULL, fxGetArrayLength(the, mxThis));
-	else {
-		if (array)
-			array = fxCheckArrayItems(the, array, 0, array->value.array.length);
-		fxSortArrayItems(the, function, array, fxGetArrayLength(the, mxThis));
-	}
+	if (array)
+		array = fxCheckArrayItems(the, array, 0, array->value.array.length);
+	fxSortArrayItems(the, function, array, fxGetArrayLength(the, mxThis));
 	mxResult->kind = mxThis->kind;
 	mxResult->value = mxThis->value;
 }