diff --git a/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java b/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
index f05b67b..295d86d 100644
--- a/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
+++ b/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
@@ -131,9 +131,14 @@ public class FbScraper {
      * cancel vestigial async tasks
      */
     void killAllTasks() {
-        for (AsyncTask task : tasks) {
-            task.cancel(true);
-            task = null;
+
+        try {
+            for (AsyncTask task : tasks) {
+                task.cancel(true);
+                task = null;
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
         }
     }
 
diff --git a/app/src/main/java/com/akdev/nofbeventscraper/MainActivity.java b/app/src/main/java/com/akdev/nofbeventscraper/MainActivity.java
index cc48272..113d575 100644
--- a/app/src/main/java/com/akdev/nofbeventscraper/MainActivity.java
+++ b/app/src/main/java/com/akdev/nofbeventscraper/MainActivity.java
@@ -172,7 +172,9 @@ public class MainActivity extends AppCompatActivity {
             public void onClick(View view) {
                 input_helper(getString(R.string.helper_add_link), true);
                 edit_text_uri_input.setText(null);
-                scraper.killAllTasks();
+                if (scraper != null) {
+                    scraper.killAllTasks();
+                }
                 input_helper(getString(R.string.helper_add_link), false);
             }
         };