Oops, fixed bug #3160

system/src/Grav/Console/Cli/ClearCacheCommand.php

@@ -12,7 +12,6 @@ namespace Grav\Console\Cli;
 use Grav\Common\Cache;
 use Grav\Console\GravCommand;
 use Symfony\Component\Console\Input\InputOption;
-use function is_callable;
 
 /**
  * Class ClearCacheCommand
@@ -47,7 +46,7 @@ class ClearCacheCommand extends GravCommand
     {
         // Old versions of Grav called this command after grav upgrade.
         // We need make this command to work with older GravCommand instance:
-        if (!is_callable($this, 'initializePlugins')) {
+        if (!method_exists($this, 'initializePlugins')) {
             Cache::clearCache('all');
 
             return 0;