Index: LibreNMS/Exceptions/UnserializableRouteCache.php
--- LibreNMS/Exceptions/UnserializableRouteCache.php.orig
+++ LibreNMS/Exceptions/UnserializableRouteCache.php
@@ -50,7 +50,7 @@ class UnserializableRouteCache extends \Exception impl
     {
         $errorMessage = "Erroneous data format for unserializing 'Symfony\Component\Routing\CompiledRoute'";
         if ($exception instanceof \ErrorException && $exception->message == $errorMessage) {
-            $cli = rtrim(shell_exec('php -r "echo PHP_VERSION;"'));
+            $cli = rtrim(shell_exec('${MODPHP_BIN} -r "echo PHP_VERSION;"'));
             if (version_compare($cli, PHP_VERSION, '!=')) {
                 return new static($exception->getMessage(), $exception->getCode(), $exception, $cli, PHP_VERSION);
             }