diff --git a/common/lua_manager.cpp b/common/lua_manager.cpp
index e31deb9f6..7716178ae 100644
--- a/common/lua_manager.cpp
+++ b/common/lua_manager.cpp
@@ -32,21 +32,20 @@ int check_file( const char* file_name, char* err_str )
     strcpy( err_str, "" );
 
     FILE *f = fopen( file_name, "r");
-    if ( 0 == f )
+    if ( !f )
         {
         G_LOG->error( err_str, "File \"%s\" not found!", file_name );
         return -1;
         }
     int version = 0;
 
-    char str[ 100 ] = "";
-    if ( char* res = fgets(str, sizeof(str), f); res != 0 )
+    if ( char str[ 100 ] = ""; fgets( str, sizeof( str ), f ) )
         {
         int err = sscanf( str, "--version = %d", &version );
         }
 
     fclose( f );
-    f = 0;
+    f = nullptr;
 
     if ( G_DEBUG )
         {
diff --git a/test/lua_manager_tests.cpp b/test/lua_manager_tests.cpp
index 690afae38..987c973d1 100644
--- a/test/lua_manager_tests.cpp
+++ b/test/lua_manager_tests.cpp
@@ -753,3 +753,18 @@ TEST( lua_manager, error_trace )
     EXPECT_NE( 0, G_LUA_MANAGER->void_exec_lua_method( "t", "no_exist3", "error_trace" ) );
     G_LUA_MANAGER->free_Lua();
     }
+
+TEST( lua_manager, check_file )
+    {
+    auto FILE_VERSION = 10;
+    char err_str[ 500 ] = {};
+    const char* FILE_NAME = "test.lua";
+    if ( FILE* f = std::fopen( FILE_NAME, "w+" ) )
+        {
+        std::fprintf( f, "--version = %d\n", FILE_VERSION );
+        std::fclose( f );
+        }
+
+    auto res = check_file( FILE_NAME, err_str );
+    EXPECT_EQ( res, FILE_VERSION );
+    }