diff --git a/app/src/main/java/com/github/catvod/crawler/JarLoader.java b/app/src/main/java/com/github/catvod/crawler/JarLoader.java
index 2025f154..14bf9837 100644
--- a/app/src/main/java/com/github/catvod/crawler/JarLoader.java
+++ b/app/src/main/java/com/github/catvod/crawler/JarLoader.java
@@ -41,7 +41,9 @@ public class JarLoader {
     }
 
     public void setRecentJarKey(String key) {
-        recentJarKey = key;
+        if (key != null && !key.isEmpty()) {
+            recentJarKey = key;
+        }
     }
 
     public void loadLiveJar(String jarUrl) {
diff --git a/gradle.properties b/gradle.properties
index 848e153d..306a3be4 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -18,4 +18,4 @@ android.useAndroidX=true
 android.enableJetifier=true
 IsDebug=true
 #build on off
-#org.gradle.jvmargs=-Xmx2048m --add-opens java.base/java.io=ALL-UNNAMED
\ No newline at end of file
+org.gradle.jvmargs=-Xmx2048m --add-opens java.base/java.io=ALL-UNNAMED
\ No newline at end of file