diff --git a/src/main/java/org/nwapw/abacus/fx/AbacusController.java b/src/main/java/org/nwapw/abacus/fx/AbacusController.java
index 8b45f85..9a4478c 100644
--- a/src/main/java/org/nwapw/abacus/fx/AbacusController.java
+++ b/src/main/java/org/nwapw/abacus/fx/AbacusController.java
@@ -68,6 +68,10 @@ public class AbacusController {
      */
     private boolean calculating;
 
+    /**
+     * Seconds delayed for timer;
+     */
+    private double delay = 0;
     private Abacus abacus;
 
     @FXML
@@ -103,6 +107,20 @@ public class AbacusController {
     private void performCalculation(){
         Runnable calculator = new Runnable(){
             public void run() {
+                if(delay>0) {
+                    Runnable timer = new Runnable() {
+                        public void run() {
+                            long gap = (long) (delay * 1000);
+                            long startTime = System.currentTimeMillis();
+                            while (System.currentTimeMillis() - startTime <= gap) {
+                            }
+                            stopCalculation();
+                        }
+                    };
+                    Thread maxTime = new Thread(timer);
+                    maxTime.setName("maxTime");
+                    maxTime.start();
+                }
                 calculating = true;
                 Platform.runLater(() -> inputButton.setDisable(true));
                 TreeNode constructedTree = abacus.parseString(inputField.getText());
@@ -135,6 +153,7 @@ public class AbacusController {
         };
         if(!calculating) {
                 calcThread = new Thread(calculator);
+                calcThread.setName("calcThread");
                 calcThread.start();
         }
     }
@@ -142,7 +161,7 @@ public class AbacusController {
     private void stopCalculation(){
         calcThread.interrupt();
         calculating = false;
-        inputButton.setDisable(false);
+        Platform.runLater(() ->inputButton.setDisable(false));
     }
 
 }
diff --git a/src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java b/src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
index f879a65..9fa9d29 100755
--- a/src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
+++ b/src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
@@ -31,9 +31,13 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             NumberInterface sum = params[0];
             for (int i = 1; i < params.length; i++) {
                 sum = sum.add(params[i]);
+                if(Thread.currentThread().isInterrupted())
+                    return null;
             }
             return sum;
         }
@@ -49,7 +53,10 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].subtract(params[1]);
+
         }
     });
     /**
@@ -63,6 +70,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].negate();
         }
     });
@@ -77,9 +86,13 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             NumberInterface product = params[0];
             for (int i = 1; i < params.length; i++) {
                 product = product.multiply(params[i]);
+                if(Thread.currentThread().isInterrupted())
+                    return null;
             }
             return product;
         }
@@ -95,6 +108,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return params[0].divide(params[1]);
         }
     });
@@ -110,15 +125,19 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             if (params[0].signum() == 0) {
                 return (new NaiveNumber(1)).promoteTo(params[0].getClass());
             }
             NumberInterface factorial = params[0];
             NumberInterface multiplier = params[0];
             //It is necessary to later prevent calls of factorial on anything but non-negative integers.
-            while (!Thread.currentThread().isInterrupted()&&(multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass()))).signum() == 1) {
+            while ((multiplier = multiplier.subtract(NaiveNumber.ONE.promoteTo(multiplier.getClass())))!=null&&multiplier.signum() == 1) {
                 factorial = factorial.multiply(multiplier);
             }
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return factorial;
                 /*if(!storedList.containsKey(params[0].getClass())){
                     storedList.put(params[0].getClass(), new ArrayList<NumberInterface>());
@@ -138,6 +157,8 @@ public class StandardPlugin extends Plugin {
 
         @Override
         protected NumberInterface applyInternal(NumberInterface[] params) {
+            if(Thread.currentThread().isInterrupted())
+                return null;
             return FUNCTION_EXP.apply(FUNCTION_LN.apply(params[0]).multiply(params[1]));
         }
     });
@@ -246,7 +267,7 @@ public class StandardPlugin extends Plugin {
             x = x.subtract(NaiveNumber.ONE.promoteTo(x.getClass())); //Terms used are for log(x+1).
             NumberInterface currentNumerator = x, currentTerm = x, sum = x;
             int n = 1;
-            while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0) {
+            while (!Thread.currentThread().isInterrupted()&&FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0) {
                 n++;
                 currentNumerator = currentNumerator.multiply(x).negate();
                 currentTerm = currentNumerator.divide(new NaiveNumber(n).promoteTo(x.getClass()));
@@ -361,7 +382,7 @@ public class StandardPlugin extends Plugin {
             }
         }
         if(Thread.currentThread().isInterrupted())
-            return null;
+            return NaiveNumber.ONE.promoteTo(numberClass);
         return list.get(n);
     }
 
diff --git a/src/main/java/org/nwapw/abacus/tree/BinaryNode.java b/src/main/java/org/nwapw/abacus/tree/BinaryNode.java
index 7d95404..c165088 100644
--- a/src/main/java/org/nwapw/abacus/tree/BinaryNode.java
+++ b/src/main/java/org/nwapw/abacus/tree/BinaryNode.java
@@ -95,12 +95,8 @@ public class BinaryNode extends TreeNode {
         if(Thread.currentThread().isInterrupted())
             return null;
         T leftReduce = left.reduce(reducer);
-        if(Thread.currentThread().isInterrupted())
-            return null;
         T rightReduce = right.reduce(reducer);
         if (leftReduce == null || rightReduce == null) return null;
-        if(Thread.currentThread().isInterrupted())
-            return null;
         T a = reducer.reduceNode(this, leftReduce, rightReduce);
         if(Thread.currentThread().isInterrupted())
             return null;
diff --git a/src/main/java/org/nwapw/abacus/tree/FunctionNode.java b/src/main/java/org/nwapw/abacus/tree/FunctionNode.java
index af0662d..b685b1c 100644
--- a/src/main/java/org/nwapw/abacus/tree/FunctionNode.java
+++ b/src/main/java/org/nwapw/abacus/tree/FunctionNode.java
@@ -67,11 +67,8 @@ public class FunctionNode extends TreeNode {
         Object[] reducedChildren = new Object[children.size()];
         for (int i = 0; i < reducedChildren.length; i++) {
             reducedChildren[i] = children.get(i).reduce(reducer);
-            if (reducedChildren[i] == null) return null;
+            if (Thread.currentThread().isInterrupted()||reducedChildren[i] == null) return null;
         }
-        //System.out.println(Thread.currentThread().isInterrupted());
-        if(Thread.currentThread().isInterrupted())
-            return null;
         T a = reducer.reduceNode(this, reducedChildren);
         if(Thread.currentThread().isInterrupted())
             return null;
diff --git a/src/main/java/org/nwapw/abacus/tree/UnaryNode.java b/src/main/java/org/nwapw/abacus/tree/UnaryNode.java
index ce1ff90..def2fd8 100644
--- a/src/main/java/org/nwapw/abacus/tree/UnaryNode.java
+++ b/src/main/java/org/nwapw/abacus/tree/UnaryNode.java
@@ -37,8 +37,6 @@ public class UnaryNode extends TreeNode {
             return null;
         Object reducedChild = applyTo.reduce(reducer);
         if (reducedChild == null) return null;
-        if(Thread.currentThread().isInterrupted())
-            return null;
         T a = reducer.reduceNode(this, reducedChild);
         if(Thread.currentThread().isInterrupted())
             return null;