diff --git a/app/src/main/java/org/fdroid/fdroid/IndexV1Updater.java b/app/src/main/java/org/fdroid/fdroid/IndexV1Updater.java
index 57554c0b7..1bbfc52f7 100644
--- a/app/src/main/java/org/fdroid/fdroid/IndexV1Updater.java
+++ b/app/src/main/java/org/fdroid/fdroid/IndexV1Updater.java
@@ -301,7 +301,7 @@ public class IndexV1Updater extends IndexUpdater {
         repo.maxage = getIntRepoValue(repoMap, "maxage");
         repo.version = getIntRepoValue(repoMap, "version");
 
-        if (platformSigCache == null || platformSigCache.isEmpty()) {
+        if (TextUtils.isEmpty(platformSigCache) {
             PackageInfo androidPackageInfo = Utils.getPackageInfo(context, "android");
             platformSigCache = Utils.getPackageSig(androidPackageInfo);
         }