diff --git a/Dockerfile.sample b/Dockerfile.sample
index 4aabdc4..46b9e84 100644
--- a/Dockerfile.sample
+++ b/Dockerfile.sample
@@ -3,7 +3,8 @@ FROM openjdk:8u252-jre
 ENV jarFileName=ContentGrabbingJi-exec.jar
 ENV CGJ_REDIS_URI="127.0.0.1:6379"
 ENV CGJ_PROXY=""
-COPY ${jarFileName} /CGJ.jar
 RUN mkdir /data/
 
+COPY ${jarFileName} /CGJ.jar
+
 CMD ["java", "-Dcgj.logsPath=/data/logs", "-jar", "/CGJ.jar", "botMode", "-botDataDir=/data"]
\ No newline at end of file
diff --git a/src/main/java/net/lamgc/cgj/Main.java b/src/main/java/net/lamgc/cgj/Main.java
index 5b76fb6..b2d91b8 100644
--- a/src/main/java/net/lamgc/cgj/Main.java
+++ b/src/main/java/net/lamgc/cgj/Main.java
@@ -129,10 +129,10 @@ public class Main {
         if(env != null) {
             System.setProperty("cgj." + sysPropKey, env);
             return true;
-        } else {
+        } else if(defaultValue != null) {
             System.setProperty("cgj." + sysPropKey, defaultValue);
-            return false;
         }
+        return false;
     }
 
     @Command