diff --git a/lib/network/cache.dart b/lib/network/cache.dart
index b7c0bd0..c47d923 100644
--- a/lib/network/cache.dart
+++ b/lib/network/cache.dart
@@ -161,7 +161,7 @@ class NetworkCacheManager implements Interceptor {
       return handler.next(response);
     }
     var size = _calculateSize(response.data);
-    if(size != null && size < 1024 * 1024 && size > 1024) {
+    if(size != null && size < 1024 * 1024 && size > 0) {
       var cache = NetworkCache(
         uri: response.requestOptions.uri,
         requestHeaders: response.requestOptions.headers,
@@ -187,6 +187,9 @@ class NetworkCacheManager implements Interceptor {
       return data.length;
     }
     if(data is String) {
+      if(data.trim().isEmpty){
+        return 0;
+      }
       return data.length * 4;
     }
     if(data is Map) {