diff --git a/include/admin/Menu.php b/include/admin/Menu.php
index 73b9952..69cb2c5 100644
--- a/include/admin/Menu.php
+++ b/include/admin/Menu.php
@@ -177,7 +177,7 @@ class Menu extends \gp\special\Base{
 			return;
 		}
 
-		$gp_menu_collapse = substr($gp_menu_collapse, $pos + strlen($search));
+		$gp_menu_collapse = substr($gp_menu_collapse, intval($pos) + intval(strlen($search)));
 		$pos = strpos($gp_menu_collapse, ']');
 		if( $pos === false ){
 			return;
diff --git a/include/thirdparty/ScssPhp/ScssPhp/Parser.php b/include/thirdparty/ScssPhp/ScssPhp/Parser.php
index 7b47f15..8c2ee75 100644
--- a/include/thirdparty/ScssPhp/ScssPhp/Parser.php
+++ b/include/thirdparty/ScssPhp/ScssPhp/Parser.php
@@ -1146,7 +1146,7 @@ class Parser
         }
 
         $r = '/' . $regex . '/' . $this->patternModifiers;
-        $result = preg_match($r, $this->buffer, $out, null, $from);
+        $result = preg_match($r, $this->buffer, $out, 0 , $from);
 
         return $result;
     }
@@ -1389,7 +1389,7 @@ class Parser
     {
         $r = '/' . $regex . '/' . $this->patternModifiers;
 
-        if (! preg_match($r, $this->buffer, $out, null, $this->count)) {
+        if (! preg_match($r, $this->buffer, $out, 0 , $this->count)) {
             return false;
         }
 
@@ -1470,7 +1470,7 @@ class Parser
     {
         $gotWhite = false;
 
-        while (preg_match(static::$whitePattern, $this->buffer, $m, null, $this->count)) {
+        while (preg_match(static::$whitePattern, $this->buffer, $m, 0, $this->count)) {
             if (isset($m[1]) && empty($this->commentsSeen[$this->count])) {
                 // comment that are kept in the output CSS
                 $comment = [];
@@ -3217,7 +3217,7 @@ class Parser
         }
 
         // match comment hack
-        if (preg_match(static::$whitePattern, $this->buffer, $m, null, $this->count)) {
+        if (preg_match(static::$whitePattern, $this->buffer, $m, 0 , $this->count)) {
             if (! empty($m[0])) {
                 $parts[] = $m[0];
                 $this->count += \strlen($m[0]);
diff --git a/include/thirdparty/cssmin_v.1.0.php b/include/thirdparty/cssmin_v.1.0.php
index 0f240e9..e7481bf 100644
--- a/include/thirdparty/cssmin_v.1.0.php
+++ b/include/thirdparty/cssmin_v.1.0.php
@@ -40,7 +40,7 @@ class cssmin
 		$search = array("/\\;\s/", "/\s*\{\\s*/", "/\\:\s+\\#/", "/,\s+/i", "/\\:\s+\\\'/i", "/\\:\s+([0-9A-Z\-]+)/i");
         $replace = array(";", "{", ":#", ",", ":\'", ":$1");
         $v = preg_replace($search, $replace, $v);
-        $v = str_replace("\n", null, $v);
+        $v = str_replace("\n", "" , $v);
     	return $v;
   		}
 	}