diff --git a/crates/nyrt/src/lib.rs b/crates/nyrt/src/lib.rs
index 11d3f397..2cb2d8ad 100644
--- a/crates/nyrt/src/lib.rs
+++ b/crates/nyrt/src/lib.rs
@@ -2386,50 +2386,66 @@ pub extern "C" fn nyash_console_log_export(ptr: *const i8) -> i64 {
     0
 }
 
-// Exported as: nyash.console.log_handle(i64 handle) -> i64  
+// Exported as: nyash.console.log_handle(i64 handle) -> i64
 #[export_name = "nyash.console.log_handle"]
 pub extern "C" fn nyash_console_log_handle(handle: i64) -> i64 {
-    if handle <= 0 { return 0; }
-    
+    if handle <= 0 {
+        return 0;
+    }
+
     if let Some(obj) = nyash_rust::jit::rt::handles::get(handle as u64) {
         let s = obj.to_string_box().value; // 既存の統一文字列変換メソッド
         println!("{}", s);
+    } else {
+        println!("{}", handle);
     }
     0
 }
 
-// Exported as: nyash.console.warn_handle(i64 handle) -> i64  
+// Exported as: nyash.console.warn_handle(i64 handle) -> i64
 #[export_name = "nyash.console.warn_handle"]
 pub extern "C" fn nyash_console_warn_handle(handle: i64) -> i64 {
-    if handle <= 0 { return 0; }
-    
+    if handle <= 0 {
+        return 0;
+    }
+
     if let Some(obj) = nyash_rust::jit::rt::handles::get(handle as u64) {
         let s = obj.to_string_box().value;
         eprintln!("WARN: {}", s);
+    } else {
+        eprintln!("WARN: {}", handle);
     }
     0
 }
 
-// Exported as: nyash.console.error_handle(i64 handle) -> i64  
+// Exported as: nyash.console.error_handle(i64 handle) -> i64
 #[export_name = "nyash.console.error_handle"]
 pub extern "C" fn nyash_console_error_handle(handle: i64) -> i64 {
-    if handle <= 0 { return 0; }
-    
+    if handle <= 0 {
+        return 0;
+    }
+
     if let Some(obj) = nyash_rust::jit::rt::handles::get(handle as u64) {
         let s = obj.to_string_box().value;
         eprintln!("ERROR: {}", s);
+    } else {
+        eprintln!("ERROR: {}", handle);
     }
     0
 }
 
-// Exported as: nyash.debug.trace_handle(i64 handle) -> i64  
+// Exported as: nyash.debug.trace_handle(i64 handle) -> i64
 #[export_name = "nyash.debug.trace_handle"]
 pub extern "C" fn nyash_debug_trace_handle(handle: i64) -> i64 {
-    if handle <= 0 { return 0; }
-    
+    if handle <= 0 {
+        return 0;
+    }
+
     if let Some(obj) = nyash_rust::jit::rt::handles::get(handle as u64) {
         let s = obj.to_string_box().value;
         eprintln!("TRACE: {}", s);
+    } else {
+        eprintln!("TRACE: {}", handle);
     }
     0
 }