Cheat Engine Scan Error Thread 0 Please Fill Something In 100 New

How to Fix “Cheat Engine Scan Error: Thread 0 – Please Fill Something In (100% New)”

If you’ve landed on this page, you’re likely staring at a frustrating pop-up window. You’ve opened Cheat Engine (CE), attached it to a process, typed a value into the “Value” box, clicked “First Scan”… and instead of a list of addresses, you see a red error message:

“Scan Error: Thread 0 – Please fill something in.”

In some versions or community discussions, this is also referred to as the “cheat engine scan error thread 0 please fill something in 100 new” error—particularly when users try to perform a “New Scan” and the engine refuses to start, citing Thread 0 and an empty input field.

This article will explain exactly what this error means, why it happens (especially with “100% new” scan attempts), and provide 10 proven solutions to get you back to memory editing.

Fix 9: Reinstall Cheat Engine

If you’re using an outdated or modded version (e.g., “100 new” custom builds from forums):

  1. Uninstall Cheat Engine via Windows Control Panel.
  2. Delete the installation folder (e.g., C:\Program Files\Cheat Engine).
  3. Download the official version from cheatengine.org.
  4. Install and test.

Quick example of correct usage

  1. Launch Cheat Engine, select the game process.
  2. In the Value box, type 100.
  3. Set Scan Type → Exact Value.
  4. Set Value Type → 4 Bytes (or appropriate).
  5. Click First Scan. ✅ No error.

Why Does This Error Happen? (Common Causes)

Before jumping into fixes, understanding the root cause prevents recurrence. Here are the top reasons for this error: How to Fix “Cheat Engine Scan Error: Thread

  1. Empty Value Field – The most common cause. You click “First Scan” or “New Scan” with nothing typed in the value box.
  2. Incorrect Value Type – You typed e.g., 100 but left the “Value Type” set to “String” or “Float” without proper formatting.
  3. Trailing Spaces – Accidentally typing a space before or after your number (e.g., 100 instead of 100).
  4. Special Characters – Using commas, dots (in non-float contexts), or letters when scanning for integers.
  5. Process Not Fully Attached – Thread 0 of the target game/process isn’t responding, so CE’s scan thread fails.
  6. Anti-Cheat Interference – Some anti-cheat systems block read/write operations, causing CE to think the input is empty.
  7. Corrupted Cheat Engine Settings – Your cheatengine-x86_64.exe settings file may be damaged.
  8. Copy-Paste Ghost Characters – Copying a value from a webpage can include invisible Unicode characters.

Possible Solutions

  1. Update Cheat Engine: Ensure you're using the latest version of Cheat Engine. Developers frequently release updates to fix bugs and improve compatibility with different games and systems.

  2. Run as Administrator: Right-click on the Cheat Engine executable and select "Run as administrator." This can solve issues related to permissions.

  3. Disable Antivirus: Sometimes, antivirus software can mistakenly flag Cheat Engine or interfere with its processes. Try temporarily disabling your antivirus to see if that resolves the issue.

  4. Check Game Compatibility: Ensure the game you're trying to use Cheat Engine with is supported. Some games have specific settings or workarounds required for use with Cheat Engine.

  5. Value Type and Scan Type: Make sure you've selected the appropriate value type and scan type for your scan. Cheat Engine offers various types of scans (exact, greater, smaller, etc.) and value types (integer, float, string, etc.). Fix 9: Reinstall Cheat Engine If you’re using

  6. Input Something in the Scan Dialog: If the error mentions filling something in, double-check the scan dialog for any fields that might need information. This could be the value you're searching for, the type of value, or specific parameters for more advanced scans.

  7. Try a Different Scan Method: Cheat Engine offers different scan methods (like "Scan for Type" or "What Accesses This Address"). Try changing the scan method.

  8. Reinstall Cheat Engine: If none of the above works, try reinstalling Cheat Engine.

4. Advanced Fix: "New Scan" vs "Next Scan"

Sometimes users click "New Scan", do not type anything, and then try to click "Next Scan".

  • The Logic: You cannot perform a "Next Scan" (filtering current results) if you haven't performed a "First Scan" (establishing a baseline).
  • The Fix:
    1. Click "New Scan".
    2. Ensure the Value box has a number OR select "Unknown initial value".
    3. Click "First Scan".
    4. Then you can change the value and click "Next Scan".

Understanding “Thread 0” in Cheat Engine

For advanced users: Thread 0 is the main thread of the debugger/injection mechanism. When you click “First Scan,” CE creates a secondary thread to scan memory, but the main UI thread (Thread 0) validates your input. If the validation fails (empty value), the error is assigned to Thread 0. Uninstall Cheat Engine via Windows Control Panel

This is why fixing the input resolves the error 99% of the time.

What does this error mean?

This error typically appears when you start a new scan (value scan) in Cheat Engine and:

  • You left the “Value” field completely blank, or
  • You entered an invalid value (e.g., text instead of a number), or
  • You started a scan without specifying what to search for.

The message is Cheat Engine’s way of saying:

“You must enter a value to scan for (e.g., 100, 5000, 999) before clicking ‘First Scan’ or ‘Next Scan’.”

The “100 new” part is a bit misleading — it’s likely a translation or UI artifact, but it essentially means: “Enter something (like 100) to begin a new scan.”

3. Root Cause Analysis

Based on user reports and debugging, common causes include:

| Cause | Description | |-------|-------------| | Invalid scan range | User left “Memory scan options” → “Start” and “Stop” addresses empty or incorrectly formatted. | | Corrupted Cheat Engine settings | Previous scan configurations saved in cheatengine-x86_64.exe.ini cause conflicts. | | Anti-cheat interference | Some anti-cheat systems (EAC, BattlEye) block memory reads and trigger this fallback error. | | Process memory protection | Target process has PAGE_GUARD or restricted pages that CE cannot scan without special settings. | | Old or beta version bug | Specific bug in CE 7.4 – 7.5 beta related to “Fast Scan” or “MEM_PRIVATE” regions. |