diff --git a/Flow.Launcher/Helper/PluginInstallationHelper.cs b/Flow.Launcher/Helper/PluginInstallationHelper.cs
index 0d3d2df67..0e94566b8 100644
--- a/Flow.Launcher/Helper/PluginInstallationHelper.cs
+++ b/Flow.Launcher/Helper/PluginInstallationHelper.cs
@@ -259,6 +259,9 @@ public static class PluginInstallationHelper
 
     private static bool InstallSourceKnown(string url)
     {
+        if (string.IsNullOrEmpty(url))
+            return false;
+
         var pieces = url.Split('/');
 
         if (pieces.Length < 4)