diff --git a/core/app/captcha/captcha-grid.php b/core/app/captcha/captcha-grid.php
index 0ad71809..0ada47c2 100644
--- a/core/app/captcha/captcha-grid.php
+++ b/core/app/captcha/captcha-grid.php
@@ -43,7 +43,7 @@ public function render($code)
 	public function __destruct()
 	{
 		// Make sure we clean up the main image when we're done.
-		if (!empty($this->image))
+		if (is_resource($this->image))
 			@imagedestroy($this->image);
 	}
 }
diff --git a/core/app/captcha/captcha-ledicons.php b/core/app/captcha/captcha-ledicons.php
index f01e7591..9e603c90 100644
--- a/core/app/captcha/captcha-ledicons.php
+++ b/core/app/captcha/captcha-ledicons.php
@@ -215,7 +215,7 @@ protected function load_font()
 	public function __destruct()
 	{
 		// Make sure we clean up the main image when we're done.
-		if (!empty($this->image))
+		if (is_resource($this->image))
 			@imagedestroy($this->image);
 
 		// Make sure we clean up any leds we created. Doing it this way means we have freedom later if we expand this to multi-colored or something.
diff --git a/core/app/captcha/captcha-ledicons_anim.php b/core/app/captcha/captcha-ledicons_anim.php
index 1c3c8614..92a93af0 100644
--- a/core/app/captcha/captcha-ledicons_anim.php
+++ b/core/app/captcha/captcha-ledicons_anim.php
@@ -137,7 +137,7 @@ protected function create_led($id, $background = false, $lowlight_col = '', $hig
 
 	protected function paint_led($id, $x, $y, $image = null)
 	{
-		imagecopy ($image, $this->leds[$id], $x, $y, 0, 0, 4, 4);
+		imagecopy($image, $this->leds[$id], $x, $y, 0, 0, 4, 4);
 	}
 
 	protected function assign_colors($image)
diff --git a/core/app/captcha/captcha-silhouette.php b/core/app/captcha/captcha-silhouette.php
index 627a07de..57a51475 100644
--- a/core/app/captcha/captcha-silhouette.php
+++ b/core/app/captcha/captcha-silhouette.php
@@ -45,7 +45,7 @@ public function render($code)
 	public function __destruct()
 	{
 		// Make sure we clean up the main image when we're done.
-		if (!empty($this->image))
+		if (is_resource($this->image))
 			@imagedestroy($this->image);
 	}
 }
diff --git a/core/app/captcha/captcha-stripes.php b/core/app/captcha/captcha-stripes.php
index 99969b5f..538945e7 100644
--- a/core/app/captcha/captcha-stripes.php
+++ b/core/app/captcha/captcha-stripes.php
@@ -76,7 +76,7 @@ public function render($code)
 	public function __destruct()
 	{
 		// Make sure we clean up the main image when we're done.
-		if (!empty($this->image))
+		if (is_resource($this->image))
 			@imagedestroy($this->image);
 	}
 }