diff --git a/src/srb/decompressor.cpp b/src/srb/decompressor.cpp
index 9ac2c95..49cc1a1 100644
--- a/src/srb/decompressor.cpp
+++ b/src/srb/decompressor.cpp
@@ -73,8 +73,13 @@ namespace srb
         };
 
         for (auto & type : types) {
-            if (std::equal(type.first.begin(), type.first.end(), line.begin())) {
+           // if(line.begin()==NULL;)
+           // {cout<<"empty file";
+            // break;}
+            if (std::equal(type.first.begin(), type.first.end(), line.begin())&&(line.begin!='\0'||type.first.begin!='\0')) {
+                
                 std::cout << "detected " << type.second
+                
                     << " compression" << std::endl;
                 return type.second;
             }