diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
index f4c8a66da31..4ceadec56fc 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
@@ -593,7 +593,10 @@ private bool InstallSourceKnown(string url)
             var constructedUrlPart = string.Format("{0}/{1}/", acceptedSource, author);
 
             return url.StartsWith(acceptedSource) &&
-                   Context.API.GetAllPlugins().Any(x => x.Metadata.Website.StartsWith(constructedUrlPart));
+                Context.API.GetAllPlugins().Any(x => 
+                    !string.IsNullOrEmpty(x.Metadata.Website) &&
+                    x.Metadata.Website.StartsWith(constructedUrlPart)
+                );
         }
 
         internal async ValueTask<List<Result>> RequestInstallOrUpdateAsync(string search, CancellationToken token,