diff --git a/core/CliMulti/Process.php b/core/CliMulti/Process.php
index a2e6f86e679..602b3491a03 100644
--- a/core/CliMulti/Process.php
+++ b/core/CliMulti/Process.php
@@ -256,7 +256,7 @@ private static function psExistsAndRunsCorrectly()
     private static function awkExistsAndRunsCorrectly()
     {
         $testResult = @shell_exec('echo " 537 s000 Ss 0:00.05 login -pfl theuser /bin/bash -c exec -la bash /bin/bash" | ' . self::AWK_COMMAND . ' 2>/dev/null');
-        return trim($testResult) == '537';
+        return trim($testResult ?? '') == '537';
     }
 
     private static function isSystemNotSupported()