diff --git a/eth-contracts/contracts/DioneOracle.sol b/eth-contracts/contracts/DioneOracle.sol
index 2463470..067d73d 100644
--- a/eth-contracts/contracts/DioneOracle.sol
+++ b/eth-contracts/contracts/DioneOracle.sol
@@ -58,7 +58,6 @@ contract DioneOracle {
 
   function requestOracles(uint8 _originChain, string memory _requestType, string memory _requestParams, address _callbackAddress, bytes4 _callbackMethodID) public returns (uint256) {
     requestCounter += 1;
-    require(pendingRequests[requestCounter].reqID == 0, "This counter is not unique");
     uint256 requestDeadline = block.timestamp.add(MAXIMUM_DELAY);
     pendingRequests[requestCounter] = OracleRequest({
       requestSender: msg.sender,
@@ -87,8 +86,7 @@ contract DioneOracle {
     require(pendingRequests[_reqID].deadline - int256(block.timestamp) >= 0, "submission has exceeded the deadline");
     delete pendingRequests[_reqID];
     dioneStaking.mine(msg.sender);
-    (bool success, ) = pendingRequests[_reqID].callbackAddress.call(abi.encodeWithSelector(pendingRequests[_reqID].callbackMethodID, _reqID, _data));
-    require(success == true, "cannot call callback method");
+    pendingRequests[_reqID].callbackAddress.call(abi.encodeWithSelector(pendingRequests[_reqID].callbackMethodID, _reqID, _data));
     emit SubmittedOracleRequest(_reqID, _data);
     return true;
   }
diff --git a/eth-contracts/test/DioneOracle.ts b/eth-contracts/test/DioneOracle.ts
index 6f7b277..483ab4b 100644
--- a/eth-contracts/test/DioneOracle.ts
+++ b/eth-contracts/test/DioneOracle.ts
@@ -27,7 +27,7 @@ describe("DioneOracle", function () {
     const timestamp = 1625097600;
     await ethers.provider.send("evm_setNextBlockTimestamp", [timestamp]);
     const requestDeadline = timestamp + 300;
-    await expect(dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", dioneOracle.address, BigNumber.from(0x8da5cb5b)))
+    await expect(dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", "0x0000000000000000000000000000000000000000", "0x00000000"))
       .to.emit(dioneOracle, 'NewOracleRequest')
       .withArgs(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", 1, requestDeadline);
 
@@ -43,7 +43,7 @@ describe("DioneOracle", function () {
   it("should create request and submit it", async function() {
     const [addr0] = await ethers.getSigners();
 
-    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", dioneOracle.address, BigNumber.from(0x8da5cb5b));
+    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", "0x0000000000000000000000000000000000000000", "0x00000000");
     const res = dioneOracle.submitOracleRequest(1, BigNumber.from(0x8da5cb5b));
     await expect(res)
       .to.emit(dioneOracle, "SubmittedOracleRequest")
@@ -55,7 +55,7 @@ describe("DioneOracle", function () {
   });
 
   it("should fail submission after request deadline", async function () {
-    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", dioneOracle.address, BigNumber.from(0x8da5cb5b));
+    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", "0x0000000000000000000000000000000000000000", "0x00000000");
 
     await ethers.provider.send("evm_increaseTime", [301]);
     await expect(dioneOracle.submitOracleRequest(1, BigNumber.from(0x8da5cb5b)))
@@ -71,4 +71,12 @@ describe("DioneOracle", function () {
     await expect(dioneOracle.cancelOracleRequest(333))
       .to.be.revertedWith("this request is not pending");
   });
+
+  it("should fail when canceling request as not request sender", async () => {
+    const [,addr1] = await ethers.getSigners();
+
+    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", "0x0000000000000000000000000000000000000000", "0x00000000");
+    await expect(dioneOracle.connect(addr1).cancelOracleRequest(1))
+      .to.be.revertedWith("you aren't request sender");
+  });
 });
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