diff --git a/src/Validators/CallValidator.php b/src/Validators/CallValidator.php
index aed5f6c..f7a83e4 100644
--- a/src/Validators/CallValidator.php
+++ b/src/Validators/CallValidator.php
@@ -29,7 +29,7 @@ class CallValidator
         if (!is_array($value)) {
             return false;
         }
-        if (isset($value['from']) && AddressValidator::validate($value['from']) === false && $value['from'] !== '') {
+        if (isset($value['from']) && AddressValidator::validate($value['from']) === false) {
             return false;
         }
         if (!isset($value['to'])) {
diff --git a/test/unit/CallValidatorTest.php b/test/unit/CallValidatorTest.php
new file mode 100644
index 0000000..e533632
--- /dev/null
+++ b/test/unit/CallValidatorTest.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Test\Unit;
+
+use Test\TestCase;
+use Web3\Validators\CallValidator;
+
+class CallValidatorTest extends TestCase
+{
+    /**
+     * validator
+     * 
+     * @var \Web3\Validators\CallValidator
+     */
+    protected $validator;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->validator = new CallValidator;
+    }
+
+    /**
+     * testValidate
+     * 
+     * @return void
+     */
+    public function testValidate()
+    {
+        $validator = $this->validator;
+
+        $this->assertEquals(false, $validator->validate('hello web3.php'));
+        $this->assertEquals(false, $validator->validate([]));
+        $this->assertEquals(false, $validator->validate([
+            'from' => '',
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+        ]));
+        $this->assertEquals(false, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'gas' => '',
+        ]));
+        $this->assertEquals(false, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'gasPrice' => '',
+        ]));
+        $this->assertEquals(false, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'value' => '',
+        ]));
+        $this->assertEquals(false, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'data' => '',
+        ]));
+        $this->assertEquals(false, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'nonce' => '',
+        ]));
+        $this->assertEquals(true, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+        ]));
+        $this->assertEquals(true, $validator->validate([
+            'to' => '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
+            'gas' => '0x76c0',
+            'gasPrice' => '0x9184e72a000',
+            'value' => '0x9184e72a',
+            'data' => '0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675',
+            'nonce' => '0x9184e72a',
+        ]));
+    }
+}
\ No newline at end of file