diff --git a/scripts/gui/gm-editor.lua b/scripts/gui/gm-editor.lua
index 576649013..38394ec36 100644
--- a/scripts/gui/gm-editor.lua
+++ b/scripts/gui/gm-editor.lua
@@ -188,7 +188,7 @@ function GmEditorUi:find(test)
     end
 end
 function GmEditorUi:find_id()
-    local key = self:getSelectedKey()
+    local key = tostring(self:getSelectedKey())
     local id = tonumber(self:getSelectedValue())
     if not id then return end
     local opts = {}