diff --git a/core/CliMulti/Process.php b/core/CliMulti/Process.php
index <HASH>..<HASH> 100644
--- a/core/CliMulti/Process.php
+++ b/core/CliMulti/Process.php
@@ -177,7 +177,7 @@ class Process
             return false;
         }
 
-        if (static::commandExists('ps') && self::returnsSuccessCode('ps') && self::commandExists('awk')) {
+        if (self::commandExists('ps') && self::returnsSuccessCode('ps') && self::commandExists('awk')) {
             return true;
         }
Fix warning detected by Scrutinizer:

Since commandExists() is declared private, calling it with static will lead to errors in possible sub-classes. You can either use self, or increase the visibility of commandExists() to at least protected.