diff --git a/source/dub/dub.d b/source/dub/dub.d
index f25a018..03bc93f 100644
--- a/source/dub/dub.d
+++ b/source/dub/dub.d
@@ -678,7 +678,7 @@
 		auto pack = getPackage(node.pack, node.config);
 		if (!pack) {
 			// this can hapen when the package description contains syntax errors
-			logDiagnostic("Invalid package in dependency tree: %s %s", node.pack, node.config);
+			logDebug("Invalid package in dependency tree: %s %s", node.pack, node.config);
 			return null;
 		}
 		foreach (dname, dspec; pack.dependencies) {
@@ -745,6 +745,8 @@
 			}
 		}
 
+		m_remotePackages[key] = null;
+
 		logWarn("Package %s %s was found neither locally, nor in the configured package registries.", name, dep);
 		return null;
 	}