diff --git a/npm_and_yarn/lib/dependabot/npm_and_yarn/update_checker/registry_finder.rb b/npm_and_yarn/lib/dependabot/npm_and_yarn/update_checker/registry_finder.rb
index aec49204bd..cb3ad6fa02 100644
--- a/npm_and_yarn/lib/dependabot/npm_and_yarn/update_checker/registry_finder.rb
+++ b/npm_and_yarn/lib/dependabot/npm_and_yarn/update_checker/registry_finder.rb
@@ -156,7 +156,7 @@ def known_registries
             begin
               registries = []
               registries += credentials
-                            .select { |cred| cred["type"] == "npm_registry" }
+                            .select { |cred| cred["type"] == "npm_registry" && cred["registry"] }
                             .tap { |arr| arr.each { |c| c["token"] ||= nil } }
               registries += npmrc_registries
               registries += yarnrc_registries
diff --git a/npm_and_yarn/spec/dependabot/npm_and_yarn/update_checker/registry_finder_spec.rb b/npm_and_yarn/spec/dependabot/npm_and_yarn/update_checker/registry_finder_spec.rb
index 21b17e93ff..5f98176ebc 100644
--- a/npm_and_yarn/spec/dependabot/npm_and_yarn/update_checker/registry_finder_spec.rb
+++ b/npm_and_yarn/spec/dependabot/npm_and_yarn/update_checker/registry_finder_spec.rb
@@ -403,6 +403,17 @@
 
       it { is_expected.to eq("registry.npmjs.org") }
     end
+
+    context "with credentials that don't have a registry" do
+      before do
+        credentials << Dependabot::Credential.new({
+          "type" => "npm_registry",
+          "registry" => nil
+        })
+      end
+
+      it { is_expected.to eq("registry.npmjs.org") }
+    end
   end
 
   describe "#auth_headers" do