diff --git a/src/GoogleTranslate.php b/src/GoogleTranslate.php
index 0dd369d..6e79e70 100644
--- a/src/GoogleTranslate.php
+++ b/src/GoogleTranslate.php
@@ -3,6 +3,7 @@
 namespace JoggApp\GoogleTranslate;
 
 use Exception;
+use InvalidArgumentException;
 use JoggApp\GoogleTranslate\Traits\SupportedLanguages;
 
 class GoogleTranslate
@@ -24,6 +25,8 @@ public function detectLanguage($input): array
             return $this->detectLanguageBatch($input);
         }
 
+        $this->validateInput($input);
+
         $response = $this
             ->translateClient
             ->detectLanguage($input);
@@ -37,6 +40,8 @@ public function detectLanguage($input): array
 
     public function detectLanguageBatch(array $input): array
     {
+        $this->validateInput($input);
+
         $responses = $this
             ->translateClient
             ->detectLanguageBatch($input);
@@ -54,6 +59,8 @@ public function detectLanguageBatch(array $input): array
 
     public function translate($input, $to = null, $format = 'text'): array
     {
+        $this->validateInput($input);
+
         $translateTo = $to ?? config('googletranslate.default_target_translation');
 
         $translateTo = $this->sanitizeLanguageCode($translateTo);
@@ -76,6 +83,8 @@ public function translate($input, $to = null, $format = 'text'): array
 
     public function justTranslate(string $input, $to = null): string
     {
+        $this->validateInput($input);
+
         $translateTo = $to ?? config('googletranslate.default_target_translation');
 
         $translateTo = $this->sanitizeLanguageCode($translateTo);
@@ -91,6 +100,8 @@ public function translateBatch(array $input, string $translateTo, $format = 'tex
     {
         $translateTo = $this->sanitizeLanguageCode($translateTo);
 
+        $this->validateInput($input);
+
         $responses = $this
             ->translateClient
             ->translateBatch($input, $translateTo, $format);
@@ -149,4 +160,17 @@ public function sanitizeLanguageCode(string $languageCode)
             get the list of valid and supported language codes by running GoogleTranslate::languages()"
         );
     }
+
+    protected function validateInput($input): void
+    {
+        if(is_array($input) && in_array(null, $input)) {
+            throw new InvalidArgumentException('Input string cannot be null');
+        }
+
+        if(is_null($input)) {
+            throw new InvalidArgumentException('Input string cannot be null');
+        }
+
+        return;
+    }
 }
diff --git a/tests/GoogleTranslateTest.php b/tests/GoogleTranslateTest.php
index 8af400e..fed6deb 100644
--- a/tests/GoogleTranslateTest.php
+++ b/tests/GoogleTranslateTest.php
@@ -202,4 +202,28 @@ public function it_sanitizes_the_language_codes()
         );
         $this->translate->sanitizeLanguageCode('xx');
     }
+
+    /** @test */
+    public function it_validates_input_against_null_strings()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->translate->translate(null, 'en');
+        $this->translate->justTranslate(null, 'en');
+    }
+
+    /** @test */
+    public function it_validates_input_against_null_strings_in_a_batch()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->translate->translateBatch([null, null], 'en');
+    }
+
+    /** @test */
+    public function it_validates_input_agaisnt_null_strings_when_detecting_a_language()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->translate->detectLanguage(null);
+        $this->translate->detectLanguage([null, null]);
+        $this->translate->detectLanguageBatch([null, null]);
+    }
 }