diff --git a/src/Helper/Shell.php b/src/Helper/Shell.php
index c45ec30..2d57bf3 100644
--- a/src/Helper/Shell.php
+++ b/src/Helper/Shell.php
@@ -58,8 +58,8 @@ class Shell
     /** @var resource The actual process resource returned from proc_open */
     protected $process = null;
 
-    /** @var int Process starting time in unix timestamp */
-    protected int $processStartTime = 0;
+    /** @var float Process starting time in unix timestamp */
+    protected float $processStartTime = 0;
 
     /** @var array Status of the process as returned from proc_get_status */
     protected ?array $processStatus = null;
@@ -104,7 +104,7 @@ protected function isWindows(): bool
 
     protected function setInput(): void
     {
-        \fwrite($this->pipes[self::STDIN_DESCRIPTOR_KEY], $this->input);
+        \fwrite($this->pipes[self::STDIN_DESCRIPTOR_KEY], $this->input ?? '');
     }
 
     protected function updateProcessStatus(): void
diff --git a/src/Output/Writer.php b/src/Output/Writer.php
index 23e691f..54add92 100644
--- a/src/Output/Writer.php
+++ b/src/Output/Writer.php
@@ -200,7 +200,7 @@ public function colorizer(): Color
      */
     public function __get(string $name): self
     {
-        if (\strpos($this->method, $name) === false) {
+        if ($this->method === null || !\str_contains($this->method, $name)) {
             $this->method .= $this->method ? \ucfirst($name) : $name;
         }