Knowledge

ERROR_INVALID_VARIANT - 604 (0x25C)

The supplied variant structure contains invalid data.

Updated: Feb 21, 2026

Technical Background

The ERROR_INVALID_VARIANT error code indicates that a supplied variant structure contains invalid data. This error is commonly encountered in scenarios where the Windows API expects a specific type of data within a variant, but receives something else.

Error Details

  • Error Name: ERROR_INVALID_VARIANT
  • Numeric Code: 604 (0x25C)
  • Short Description: The supplied variant structure contains invalid data.

This error typically occurs when the API expects a specific type of data, such as an integer or string, but receives a different type. For example, if the API requires an integer value and is passed a string, this error will be generated.

Common Causes

  • Invalid Parameter Values: Passing incorrect or unexpected values to the API function.
  • Incorrect Object Type: Providing data of the wrong type for the expected variant structure.
  • Exceeding Limits: Attempting to pass data that exceeds the allowed size or format constraints.

Real-World Context

This error can occur in various scenarios, such as when working with COM objects, handling user input, or processing data passed from other applications. It is important to ensure that all parameters are correctly typed and formatted before passing them to API functions.

Is This Error Critical?

The severity of this error depends on the context in which it occurs. While it does not typically indicate a critical system failure, it can prevent certain operations from completing successfully. Developers should handle such errors gracefully by validating input data and providing appropriate feedback or recovery mechanisms.

How to Diagnose

To diagnose ERROR_INVALID_VARIANT, follow these steps:

  1. Review Operation Context: Ensure that the operation is being performed in an appropriate context, such as a valid session or process.
  2. Validate Parameters: Check all input parameters for correctness and ensure they match the expected data types.
  3. Confirm Object Types: Verify that the objects passed to the API function are of the correct type and format.
  4. Verify Input Data: Ensure that any user-provided or external data is properly formatted and within acceptable limits.
  5. Check Limits or Constraints: Confirm that no input exceeds system-defined limits, such as maximum string length or buffer size.

How to Resolve

To resolve ERROR_INVALID_VARIANT, take the following actions:

  1. Correct Parameter Usage: Ensure all parameters are correctly typed and formatted according to the API documentation.
  2. Adjust Operation Context: If necessary, adjust the operation context to ensure it is valid for the API function being called.
  3. Restore Data: If data corruption or invalidation occurred, restore the correct values before retrying the operation.
  4. Retry Operation with Valid Inputs: After correcting any issues, attempt to perform the operation again using valid inputs.

Developer Notes

Developers should be aware of the specific requirements for variant structures and ensure that all input parameters are validated against these requirements. This can prevent ERROR_INVALID_VARIANT errors and improve overall application robustness.

Related Errors

  • ERROR_TYPE_MISMATCH: Occurs when a type mismatch is detected in data passed to an API function.
  • ERROR_BAD_EXE_FORMAT: Indicates that the format of an executable file is incorrect or unsupported.
  • ERROR_INVALID_PARAMETER: A generic error indicating that one or more parameters are invalid, which may include issues with variant structures.

FAQ

Q: What does ERROR_INVALID_VARIANT mean?

A: It indicates that a supplied variant structure contains invalid data, such as incorrect type or format.

Q: How can I prevent this error from occurring?

A: Ensure all input parameters are correctly typed and formatted according to the API documentation. Validate user inputs and check for any data corruption before passing them to API functions.

Q: Is ERROR_INVALID_VARIANT a critical system error?

A: No, it is not typically a critical system error but can prevent certain operations from completing successfully.

Summary

The ERROR_INVALID_VARIANT error code indicates that the supplied variant structure contains invalid data. This error is specific to parameter validation and can occur in various scenarios where incorrect or unexpected values are passed to API functions. Developers should ensure proper input validation and handling of such errors to maintain application robustness.