diff --git a/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java b/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
index 2d7f440c..31856a93 100644
--- a/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
+++ b/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
@@ -212,7 +212,7 @@ public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 			}
 		}
 		long totalTime = System.currentTimeMillis() - beginTime;
-		if (totalTime > 3000){
+		if (totalTime > 3000 && object != null){
 			logger.warn(object.getClass() + " unserialize time: " + TimeUtils.formatDateAgo(totalTime));
 		}
 		return object;
@@ -255,7 +255,7 @@ public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 		long beginTime = System.currentTimeMillis();
 		Object object = fstConfiguration.get().asObject(bytes);
 		long totalTime = System.currentTimeMillis() - beginTime;
-		if (totalTime > 3000){
+		if (totalTime > 3000 && object != null){
 			logger.warn(object.getClass() + " fst unserialize time: " + TimeUtils.formatDateAgo(totalTime));
 		}
 		return object;
diff --git a/common/src/main/java/com/jeesite/common/reflect/ClassUtils.java b/common/src/main/java/com/jeesite/common/reflect/ClassUtils.java
index 3976f13f..883f4bec 100644
--- a/common/src/main/java/com/jeesite/common/reflect/ClassUtils.java
+++ b/common/src/main/java/com/jeesite/common/reflect/ClassUtils.java
@@ -288,7 +288,10 @@ abstract class VFS {
 
 		// Try each implementation class until a valid one is found
 		VFS vfs = null;
-		for (int i = 0; vfs == null || !vfs.isValid(); i++) {
+		for (int i = 0; true; i++) {
+			if (!(vfs == null || !vfs.isValid())) {
+				break;
+			}
 			Class<? extends VFS> impl = impls.get(i);
 			try {
 				vfs = impl.getDeclaredConstructor().newInstance();
@@ -302,7 +305,7 @@ abstract class VFS {
 			}
 		}
 
-		log.debug("Using VFS adapter " + vfs.getClass().getName());
+		log.debug("Using VFS adapter " + vfs == null ? null : vfs.getClass().getName());
 		return VFS.instance = vfs;
 	}