From 2fa51fc99737118060a04ba5078f36b3c9a2adca Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Fri, 28 Jul 2017 11:19:41 -0700
Subject: [PATCH] Fix null pointer exceptions associated with turning ! into an
 operator.

---
 src/org/nwapw/abacus/plugin/StandardPlugin.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/org/nwapw/abacus/plugin/StandardPlugin.java b/src/org/nwapw/abacus/plugin/StandardPlugin.java
index 68a733e..a6b6766 100755
--- a/src/org/nwapw/abacus/plugin/StandardPlugin.java
+++ b/src/org/nwapw/abacus/plugin/StandardPlugin.java
@@ -246,7 +246,7 @@ public class StandardPlugin extends Plugin {
      * @return the nth term of the series.
      */
     private NumberInterface getExpSeriesTerm(int n, NumberInterface x){
-        return x.intPow(n).divide(this.getFunction("!").apply((new NaiveNumber(n)).promoteTo(x.getClass())));
+        return x.intPow(n).divide(this.getOperator("!").getFunction().apply((new NaiveNumber(n)).promoteTo(x.getClass())));
     }
 
     /**