diff --git a/src/Carbon/Traits/Creator.php b/src/Carbon/Traits/Creator.php
index 35fa5ec359..7adf61adde 100644
--- a/src/Carbon/Traits/Creator.php
+++ b/src/Carbon/Traits/Creator.php
@@ -384,7 +384,7 @@ public static function create($year = 0, $month = 1, $day = 1, $hour = 0, $minut
         $second = ($second < 10 ? '0' : '').number_format($second, 6);
         $instance = static::rawCreateFromFormat('!Y-n-j G:i:s.u', sprintf('%s-%s-%s %s:%02s:%02s', $year, $month, $day, $hour, $minute, $second), $tz);
 
-        if ($fixYear !== null) {
+        if ($instance && $fixYear !== null) {
             $instance = $instance->addYears($fixYear);
         }
 
@@ -563,7 +563,7 @@ private static function createFromFormatAndTimezone(string $format, string $time
 
         $tz = static::safeCreateDateTimeZone($tz, $originalTz);
 
-        if ($tz === false) {
+        if ($tz === null) {
             return null;
         }
 
diff --git a/tests/Carbon/CreateSafeTest.php b/tests/Carbon/CreateSafeTest.php
index 374a19fb5a..7d34bf9d36 100644
--- a/tests/Carbon/CreateSafeTest.php
+++ b/tests/Carbon/CreateSafeTest.php
@@ -37,7 +37,7 @@ public function testCreateSafeThrowsExceptionForSecondLowerThanZero()
     public function testCreateSafeThrowsExceptionForSecondLowerThanZeroInStrictMode()
     {
         Carbon::useStrictMode(false);
-        $this->assertFalse(Carbon::createSafe(null, null, null, null, null, -1));
+        $this->assertNull(Carbon::createSafe(null, null, null, null, null, -1));
         Carbon::useStrictMode(true);
     }
 
@@ -187,7 +187,7 @@ public function testCreateSafeThrowsExceptionForInvalidDayForFebruaryInLeapYear(
     public function testCreateSafeThrowsExceptionForInvalidDayForFebruaryInLeapYearInStrictMode()
     {
         Carbon::useStrictMode(false);
-        $this->assertFalse(Carbon::createSafe(2016, 2, 30, 17, 16, 15));
+        $this->assertNull(Carbon::createSafe(2016, 2, 30, 17, 16, 15));
         Carbon::useStrictMode(true);
     }