check if moveToPost is defined before parsing n/p hotkeys

diff --git a/functions.js b/functions.js
index ec129aeb16ab7cacbf72b2dd938a728cb553ce59..aec6a82c0342fce2f517c6cd8693c2599837c6a8 100644 (file)
--- a/functions.js
+++ b/functions.js
@@ -203,11 +203,15 @@ function hotkey_handler(e) {
                }
 
                if (keycode == 78 || keycode == 40) { // n, down
-                       return h_ctx.moveToPost('next');
+                       if (typeof h_ctx.moveToPost != undefined) {
+                               return h_ctx.moveToPost('next');
+                       }
                }
        
                if (keycode == 80 || keycode == 38) { // p, up
-                       return h_ctx.moveToPost('prev');
+                       if (typeof h_ctx.moveToPost != undefined) {
+                               return h_ctx.moveToPost('prev');
+                       }
                }
                
                if (typeof localHotkeyHandler != 'undefined') {