Handle interval == 0 windups

api/src/main/java/de/erethon/dungeonsxl/api/sign/Windup.java

@@ -153,8 +153,12 @@ public abstract class Windup extends Deactivatable {
 
     @Override
     public void activate() {
-        active = true;
+        if (interval <= 0) {
-        startTask();
+            runnable.run();
+        } else {
+            active = true;
+            startTask();
+        }
     }
 
     /**
@@ -163,7 +167,9 @@ public abstract class Windup extends Deactivatable {
     @Override
     public void deactivate() {
         active = false;
-        getTask().cancel();
+        if (getTask() != null) {
+            getTask().cancel();
+        }
     }
 
     /**

core/src/main/java/de/erethon/dungeonsxl/sign/windup/DropSign.java

@@ -102,14 +102,4 @@ public class DropSign extends Windup {
         });
     }
 
-    @Override
-    public void activate() {
-        if (interval < 0) {
-            active = true;
-            getRunnable().run();
-        } else {
-            super.activate();
-        }
-    }
-
 }