diff --git a/exception.go b/exception.go
index e4aacf4..09734c9 100644
--- a/exception.go
+++ b/exception.go
@@ -31,6 +31,9 @@ func (ex *custom) With(innerErr ...error) Custom {
 }
 
 func (ex *custom) IsSameAs(err error) bool {
+	if err == nil {
+		return false
+	}
 	return strings.HasPrefix(err.Error(), fmt.Sprintf("[%s]:", ex.message))
 }
 
diff --git a/exception_test.go b/exception_test.go
index eae5ae5..fb7d94c 100644
--- a/exception_test.go
+++ b/exception_test.go
@@ -46,6 +46,7 @@ func (suite *CustomExceptionTestSuite) TestShouldCompareExceptions() {
 	suite.False(NotFoundException.IsSameAs(InvalidArgumentException))
 	suite.False(NotFoundException.IsSameAs(customErr))
 	suite.False(InvalidArgumentException.IsSameAs(customErr))
+	suite.False(InvalidArgumentException.IsSameAs(nil))
 }
 
 func TestCustomExceptionTestSuite(t *testing.T) {