diff --git a/README.md b/README.md
index 64b7cd2..3b72b89 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,11 @@ https://youtu.be/rYehqByJPHs
 
 ## Changelog
 
+### 18/12/2021
+
+- Removed single claims -> Claim all to reduce transactions
+- fixed bug: null reference
+
 ### 12/12/2021
 
 - Added a random pause between actions
diff --git a/index.js b/index.js
index e323a1b..fa2106f 100644
--- a/index.js
+++ b/index.js
@@ -1,19 +1,18 @@
 (async () => {
-  const random = (min, max) =>
-    Math.floor(Math.random() * (max - min + 1) + min);
+  const random = (min, max) => Math.floor(Math.random() * (max - min + 1) + min);
 
   // Pause between tab switches (10 sec)
   const pauseBetweenTabSwitches = [5 * 1000, 15 * 1000];
-  // Pause after mining (20 sec)
-  const pauseAndAfterMinig = [15 * 1000, 25 * 1000];
+  // Pause after mining (40 sec)
+  const pauseAndAfterMinig = [35 * 1000, 45 * 1000];
 
   // Close error popup if need
   setInterval(() => {
     const btnCancel = document.querySelector(
       ".container-card-error .btn-cancel"
     );
-
-    if (btnCancel) btnCancel?.click();
+    if (btnCancel) 
+      btnCancel?.click();
   }, random(8 * 1000, 12 * 1000));
 
   setInterval(() => {
@@ -38,25 +37,28 @@
     for (const leftPanelBt of leftPanelBts) {
       leftPanelBt.click();
       await new Promise((res) =>
-        setTimeout(res, random(...pauseBetweenTabSwitches))
-      );
+        setTimeout(res, random(...pauseBetweenTabSwitches)));
 
+      // claim and withdraw  
       const claimBtns = [...document.querySelectorAll(".btn-claim")];
+      if(claimBtns.length > 0) {
+        const claimBtn = document.querySelector(".btn-claim");
+        try { claimBtn.click(); } catch {} 
+        await new Promise((res) =>
+              setTimeout(res, random(...pauseAndAfterMinig)));
+      }
 
-      for (let i = claimBtns.length; i > 1; --i) {
-        const claimBtn = document.querySelector(
-          `.container-menu-right .h-full:nth-child(${i - 1}) .btn-claim`
-        );
-        claimBtn.click();
-
+      // repair
+      const repBtns = [...document.querySelectorAll(".btn-mine")];
+      if(repBtns.length > 0) {
+        const repBtns = document.querySelector(".btn-mine");
+        try { repBtns.click(); } catch {} 
         await new Promise((res) =>
-          setTimeout(res, random(...pauseAndAfterMinig))
-        );
+              setTimeout(res, random(...pauseAndAfterMinig)));
       }
     }
 
     await new Promise((res) =>
-      setTimeout(res, random(...pauseBetweenTabSwitches))
-    );
+      setTimeout(res, random(...pauseBetweenTabSwitches)));
   }
 })();