Fixed error.

pom.xml

@@ -50,7 +50,7 @@
         <dependency>
             <groupId>org.spigotmc</groupId>
             <artifactId>spigot</artifactId>
-            <version>1.14-pre5</version>
+            <version>1.14</version>
         </dependency>
         <dependency>
             <groupId>com.songoda</groupId>

src/main/java/com/songoda/ultimaterepairing/UltimateRepairing.java

@@ -184,6 +184,8 @@ public final class UltimateRepairing extends JavaPlugin implements Listener {
         // Wipe old kit information
         dataFile.getConfig().set("data", null);
 
+        if (anvilManager.getAnvils() == null) return;
+        
         /*
          * Save anvils from AnvilManager to Configuration.
          */