graph: only use local json when no json provided by CGP

To prevent from this warning:
> array_merge(): Argument #1 is not an array

1 files changed, 5 insertions, 1 deletions

diff --git a/graph.php b/graph.php
index d4242ea..fc1eb83 100644
--- a/graph.php
+++ b/graph.php
@@ -51,7 +51,11 @@ if(function_exists('json_decode'))
                 if (is_null($plugin_json_local))
                         error_log('CGP Error: invalid json in plugin/local/'.$plugin.'.json');
 
-                $plugin_json = array_replace_recursive($plugin_json, $plugin_json_local);
+                if (is_array($plugin_json)) {
+                        $plugin_json = array_replace_recursive($plugin_json, $plugin_json_local);
+                } else {
+                        $plugin_json = $plugin_json_local;
+                }
         }
 }