What It Means & How to Fix It in UE5

---

🧠 Why You’re Seeing This Error

This error means a loop in your Blueprint ran too many times in a single frame, hitting Unreal Engine’s safety cap to prevent freezing or crashing.

By default, UE5 limits any loop (For, While, etc.) to 1,000,000 iterations per frame. If your loop exceeds that, UE will force it to stop and throw this error.

---

💥 Example Error Message

Blueprint Runtime Error: "Loop execution limit reached" in [YourBlueprint]

---

🛠️ Common Blueprint Scenario

[For Each Loop]
    → Array has 1,500,000 items
    → Logic inside loop takes time or doesn't break

Result: Exceeds the iteration limit

Or:

[While Loop]
    → Condition never becomes false
    → Infinite loop behavior detected

---

✅ How to Fix It in UE5 – Step-by-Step

---

✔️ 1. Add a Break Condition to the Loop

Use:

[For Each Loop With Break]
    → If (SomeConditionMet) → Break

This prevents the loop from running endlessly.

---

✔️ 2. Spread Work Over Multiple Frames

For large data sets or long-running logic:

- Use a Timer
- Use Delays between iterations
- Break work into chunks using Custom Events

Example:

[Event BeginPlay]
    → Call CustomEvent_ChunkLoop (process 100 items per call)
    → Delay (0.01)
    → Call CustomEvent_ChunkLoop again

---

✔️ 3. Use a Manual Counter to Limit the Loop

Example:

[While Loop]
    → Add 1 to LoopCounter
    → If LoopCounter > 500 → Break

This acts as a safety stop and avoids running forever.

---

✔️ 4. Avoid Large Loops in Construction Script

Construction Scripts run in the editor and every time something is updated — avoid expensive loops here completely.

---

✅ Summary: How to Fix “Loop Execution Limit Reached” in UE5

Cause	Fix Example
Loop ran more than 1,000,000 times	Use ForEachWithBreak or add custom break logic
Condition never ends	Add a counter or change condition logic
Heavy logic on large arrays	Spread work across frames using Timers, Delays, or Chunk Loops
Infinite loop pattern	Add failsafes or exit points