diff --git a/plugins/koinsight.koplugin/settings.lua b/plugins/koinsight.koplugin/settings.lua
index 01643794..5c1febdf 100644
--- a/plugins/koinsight.koplugin/settings.lua
+++ b/plugins/koinsight.koplugin/settings.lua
@@ -219,9 +219,28 @@ function KoInsightSettings:editServerSettings()
           text = _("Apply"),
           callback = function()
             local myfields = self.settings_dialog:getFields()
-            self:setServerURL(myfields[1])
+            local server_url = myfields[1]
+
+            if server_url == "" then
+                UIManager:show(InfoMessage:new({
+                    text = _("Please enter a server URL."),
+                }))
+                return
+            end
+
+            if not server_url:match("^https?://") then
+                UIManager:show(InfoMessage:new({
+                    text = _("The server URL must start with 'http://' or 'https://'.\n\n"),
+                }))
+                return
+            end
+
+            self:setServerURL(server_url)
             UIManager:close(self.settings_dialog)
-            UIManager:show(InfoMessage:new({ text = _("KoInsight settings saved."), timeout = 2 }))
+            UIManager:show(InfoMessage:new({
+                text = _("KoInsight settings saved."),
+                timeout = 2,
+            }))
           end,
         },
       },